Howmet Aerospace (HWM) 10-K 13 Feb 25 2024 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Feb. 10, 2025	Jun. 30, 2024
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-3610
Entity Registrant Name	HOWMET AEROSPACE INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	25-0317820
Entity Address, Address Line One	201 Isabella Street, Suite 200
Entity Address, City or Town	Pittsburgh
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15212-5872
City Area Code	412
Local Phone Number	553-1940
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 31
Entity Common Stock, Shares Outstanding		405,022,519
Documents Incorporated by Reference	Part III of this Form 10-K incorporates by reference certain information from the registrant’s definitive Proxy Statement for its 2025 Annual Meeting of Shareholders to be filed pursuant to Regulation 14A (Proxy Statement).
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Entity Central Index Key	0000004281
Common stock
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $1.00 per share
Trading Symbol	HWM
Security Exchange Name	NYSE
Preferred stock
Entity Information [Line Items]
Title of 12(b) Security	$3.75 Cumulative Preferred Stock, par value $100.00 per share
Trading Symbol	HWM PR
Security Exchange Name	NYSEAMER

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024
Audit Information [Abstract]
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Pittsburgh, Pennsylvania
Auditor Firm ID	238

Statement of Consolidated Opera

Statement of Consolidated Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Sales (C)	$ 7,430	$ 6,640	$ 5,663
Cost of goods sold (exclusive of expenses below)	5,119	4,773	4,103
Selling, general administrative, and other expenses	347	333	288
Research and development expenses	33	36	32
Provision for depreciation and amortization	277	272	265
Restructuring and other charges (D)	21	23	56
Operating income	1,633	1,203	919
Loss on debt redemption (Q)	6	2	2
Interest expense, net (E)	182	218	229
Other expense, net (F)	62	8	82
Income before income taxes	1,383	975	606
Provision for income taxes (H)	228	210	137
Net income	1,155	765	469
Amounts Attributable to Howmet Aerospace Inc. Common Shareholders (J):
Net income	1,153	763	467
Net income	$ 1,153	$ 763	$ 467
Earnings per share:
Basic (in usd per share)	$ 2.83	$ 1.85	$ 1.12
Diluted (in usd per share)	$ 2.81	$ 1.83	$ 1.11
Average Shares Outstanding (I):
Basic (in shares)	408	412	416
Diluted (in shares)	410	416	421

Statement of Consolidated Compr

Statement of Consolidated Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 1,155	$ 765	$ 469
Other comprehensive (loss) income, net of tax (K):
Change in unrecognized net actuarial loss and prior service cost (benefit) related to pension and other postretirement benefits	17	(36)	146
Foreign currency translation adjustments	(71)	57	(131)
Net change in unrecognized gains (losses) on cash flow hedges	6	(10)	7
Total Other comprehensive (loss) income, net of tax	(48)	11	22
Comprehensive income	$ 1,107	$ 776	$ 491

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 564	$ 610
Receivables from customers, less allowances of $— in both 2024 and 2023 (L)	689	675
Other receivables (L)	20	17
Inventories (M)	1,840	1,765
Prepaid expenses and other current assets	249	249
Total current assets	3,362	3,316
Properties, plants, and equipment, net (N)	2,386	2,328
Goodwill (A and O)	4,010	4,035
Deferred income taxes (H)	35	46
Intangibles, net (O)	475	505
Other noncurrent assets (A and P)	251	198
Total assets	10,519	10,428
Current liabilities:
Accounts payable, trade	948	982
Accrued compensation and retirement costs	305	263
Taxes, including income taxes	60	68
Accrued interest payable	59	65
Other current liabilities (A and P)	171	200
Long-term debt due within one year (Q and R)	6	206
Total current liabilities	1,549	1,784
Long-term debt, less amount due within one year (Q and R)	3,309	3,500
Accrued pension benefits (G)	625	664
Accrued other postretirement benefits (G)	54	92
Other noncurrent liabilities and deferred credits (A and P)	428	351
Total liabilities	5,965	6,391
Contingencies and commitments (U)
Howmet Aerospace Inc. shareholders’ equity:
Preferred stock (I)	55	55
Common stock (I)	405	410
Additional capital (I)	3,206	3,682
Retained earnings (A)	2,766	1,720
Accumulated other comprehensive loss (A and K)	(1,878)	(1,830)
Total equity	4,554	4,037
Total liabilities and equity	$ 10,519	$ 10,428

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Receivables from customers, allowance	$ 0	$ 0

Statement of Consolidated Cash

Statement of Consolidated Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating activities
Net income	$ 1,155	$ 765	$ 469
Adjustments to reconcile net income to cash provided from operations:
Depreciation and amortization	277	272	265
Deferred income taxes	55	108	79
Restructuring and other charges	21	23	56
Net realized and unrealized losses	25	22	18
Net periodic pension cost (G)	40	37	24
Stock-based compensation	63	50	54
Loss on debt redemption (Q)	6	2	2
Other	1	3	12
Changes in assets and liabilities, excluding effects of acquisitions, divestitures, and foreign currency translation adjustments:
Increase in receivables (L)	(57)	(164)	(161)
Increase in inventories	(106)	(142)	(234)
Increase in prepaid expenses and other current assets	(14)	(24)	(6)
(Decrease) increase in accounts payable, trade	(49)	(7)	246
Increase in accrued expenses	5	37	23
Decrease in taxes, including income taxes	(14)	(7)	(12)
Pension contributions	(79)	(36)	(43)
(Increase) decrease in noncurrent assets	(3)	(4)	1
Decrease in noncurrent liabilities	(28)	(34)	(60)
Cash provided from operations	1,298	901	733
Financing Activities
Net change in short-term borrowings	0	0	(5)
Additions to debt (Q)	500	400	0
Repurchases and payments on debt (Q)	(865)	(876)	(69)
Debt issuance costs (Q)	(5)	(2)	0
Premiums paid on early redemption of debt (Q)	(5)	(1)	(2)
Repurchases of common stock (I)	(500)	(250)	(400)
Proceeds from exercise of employee stock options	8	11	16
Dividends paid to shareholders (I)	(109)	(73)	(44)
Taxes paid for net share settlement of equity awards	(49)	(77)	(22)
Other	(1)	0	0
Cash used for financing activities	(1,026)	(868)	(526)
Investing Activities
Capital expenditures (C and S)	(321)	(219)	(193)
Acquisitions, net of cash acquired	(5)	0	0
Proceeds from the sale of assets and businesses (D and T)	9	2	58
Other	1	2	0
Cash used for investing activities	(316)	(215)	(135)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1)	0	(2)
Net change in cash, cash equivalents and restricted cash	(45)	(182)	70
Cash, cash equivalents and restricted cash at beginning of year	610	792	722
Cash, cash equivalents and restricted cash at end of year	$ 565	$ 610	$ 792

Statement of Changes in Consoli

Statement of Changes in Consolidated Equity - USD ($) $ in Millions	Total	Preferred Class A	Preferred stock	Common stock	Additional capital	Retained earnings	Retained earnings Preferred Class A	Accumulated other comprehensive loss
Beginning balance at Dec. 31, 2021	$ 3,508		$ 55	$ 422	$ 4,291	$ 603		$ (1,863)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	469					469
Other comprehensive income (loss) (K)	22							22
Cash dividends declared:
Preferred		$ (2)					$ (2)
Common	(42)					(42)
Repurchase and retirement of common stock (I)	(400)			(12)	(388)
Stock-based compensation (I)	54				54
Common stock issued: compensation plans (I)	(8)			2	(10)
Ending balance at Dec. 31, 2022	3,601		55	412	3,947	1,028		(1,841)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	765					765
Other comprehensive income (loss) (K)	11							11
Cash dividends declared:
Preferred		(2)					(2)
Common	(71)					(71)
Repurchase and retirement of common stock (I)	(251)			(5)	(246)
Stock-based compensation (I)	50				50
Common stock issued: compensation plans (I)	(66)			3	(69)
Ending balance at Dec. 31, 2023	4,037		55	410	3,682	1,720		(1,830)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,155					1,155
Other comprehensive income (loss) (K)	(48)							(48)
Cash dividends declared:
Preferred		$ (2)					$ (2)
Common	(107)					(107)
Repurchase and retirement of common stock (I)	(504)			(6)	(498)
Stock-based compensation (I)	63				63
Common stock issued: compensation plans (I)	(40)			1	(41)
Ending balance at Dec. 31, 2024	$ 4,554		$ 55	$ 405	$ 3,206	$ 2,766		$ (1,878)

Statement of Changes in Conso_2

Statement of Changes in Consolidated Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Common (in usd per share)	$ 0.26	$ 0.17	$ 0.10
Preferred Class A
Preferred (in usd per share)	$ 3.75	$ 3.75	$ 3.75

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation. The Consolidated Financial Statements of Howmet Aerospace Inc. (formerly known as Arconic Inc.) and subsidiaries (“Howmet” or the “Company” or “we” or “our”) are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and require management to make certain judgments, estimates, and assumptions. These estimates are based on historical experience and, in some cases, assumptions based on current and future market expectations, including considerations relating to changes in the aerospace industry. The impact of these changes, including the macroeconomic considerations, remains highly uncertain. Management has made its best estimates using all relevant information available at the time, but it is possible that our estimates will differ from our actual results and affect the Consolidated Financial Statements in future periods and potentially require adverse adjustments to the recoverability of goodwill, intangible and long-lived assets, the realizability of deferred tax assets, and other judgments and estimations and assumptions. These may affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements. They also may affect the reported amounts of sales and expenses during the reporting period. Actual results could differ from those estimates upon subsequent resolution of identified matters. Certain amounts in previously issued financial statements were reclassified to conform to the current period presentation. The Company derived approximately 52% , 49%, and 46% of its revenue from products sold to the commercial aerospace market for the years ended December 31, 2024, 2023, and 2022, respectively. Aircraft production in the commercial aerospace industry continues to grow based on increases in demand for narrow body and wide body aircraft. We expect our commercial aerospace wide body and narrow body demand, including engine spares, also to continue to grow. Quality control issues at The Boeing Company (“Boeing”) have had and are expected to continue to have a negative impact on narrow body and wide body production rates in the near term. For instance, the Federal Aviation Administration stated that it will not approve production rate increases above 38 aircraft per month or additional production lines for the Boeing 737 MAX until it is satisfied that Boeing is in full compliance with required quality control procedures. In addition, a labor union work stoppage and ensuing production restart at Boeing has negatively impacted results. Boeing production levels have had and are expected to have a material impact on the financial performance of Howmet. The timing and level of future aircraft builds by original equipment manufacturers are subject to changes and uncertainties, which may cause our future results to differ from prior periods due to changes in product mix in certain segments. Principles of Consolidation. The Consolidated Financial Statements include the accounts of Howmet Aerospace Inc. and companies in which Howmet Aerospace Inc. has a controlling interest. Intercompany transactions have been eliminated. Investments in affiliates in which Howmet Aerospace Inc. cannot exercise significant influence that do not have readily determinable fair values are accounted for at cost less impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. Management also evaluates whether a Howmet Aerospace Inc. entity or interest is a variable interest entity and whether Howmet Aerospace Inc. is the primary beneficiary. Consolidation is required if both of these criteria are met. Howmet Aerospace Inc. does not have any variable interest entities requiring consolidation. Cash Equivalents. Cash equivalents are highly liquid investments purchased with an original maturity of three months or less. Inventory Valuation. Inventories are carried at the lower of cost or net realizable value with the cost of inventories determined under a combination of the first-in, first-out (“FIFO”), last-in, first-out (“LIFO”) and average-cost methods. LIFO is used for inventory valuation for certain of the U.S. locations in the Engine Products, Engineered Structures, and Forged Wheels segments, See Note M for further details. Properties, Plants, and Equipment. Properties, plants, and equipment are recorded at cost. Depreciation is recorded principally on the straight-line method at rates based on the estimated useful lives of the assets. The following table details the weighted-average useful lives of structures and machinery and equipment by reporting segment (numbers in years): Structures Machinery and equipment Engine Products 28 16 Fastening Systems 27 17 Engineered Structures 29 20 Forged Wheels 27 18 Gains or losses from the sale of asset groups or properties are generally recorded in Restructuring and other charges while the sale of individual assets are recorded in Other expense, net (see policy below for assets classified as discontinued operations and held for sale). Repairs and maintenance are charged to expense as incurred. Interest related to the construction of qualifying assets is capitalized as part of the construction costs. Properties, plants, and equipment are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets (asset group) may not be recoverable. Recoverability of assets is determined by comparing the estimated undiscounted net cash flows of the operations related to the assets (asset group) to their carrying amount. An impairment loss would be recognized when the carrying amount of the assets (asset group) exceeds the estimated undiscounted net cash flows. The amount of the impairment loss to be recorded is measured as the excess of the carrying value of the assets (asset group) over their fair value, with fair value determined using the best information available, which generally is a discounted cash flow (“DCF”) model. The determination of what constitutes an asset group, the associated estimated undiscounted net cash flows, and the estimated useful lives of the assets also require significant judgments. See Note N for further details. Goodwill. Goodwill is not amortized; instead, it is reviewed for impairment annually (in the fourth quarter) or more frequently if indicators of impairment exist or if a decision is made to sell or realign a business. A significant amount of judgment is involved in determining if an indicator of impairment has occurred. Such indicators may include deterioration in general economic conditions, negative developments in equity and credit markets, adverse changes in the markets in which an entity operates, increases in input costs that have a negative effect on earnings and cash flows, or a trend of negative or declining cash flows over multiple periods, among others. The fair value that could be realized in an actual transaction may differ from that used to evaluate the impairment of goodwill. Goodwill is allocated among and evaluated for impairment at the reporting unit level, which is defined as an operating segment or one level below an operating segment. Howmet has four reporting units composed of the Engine Products, Fastening Systems, Engineered Structures, and Forged Wheels segments. Howmet determines annually, based on facts and circumstances, which of its reporting units will be subject to the qualitative assessment. Under the qualitative assessment, various events and circumstances (similar to the impairment indicators above) that would affect the estimated fair value of a reporting unit are identified to determine if a quantitative assessment should be performed. Management also considers the most recent forecasted cash flows and discount rates in determining if the prior fair value measurement estimate may be reduced to a level that would indicate impairment is more likely than not and compares the weighted average cost of capital (“WACC”) between the current and prior years for each reporting unit. If management concludes it is more likely than not (greater than 50%) that the estimated fair value of a reporting unit is less than its carrying amount, we will proceed directly to the quantitative impairment test. Howmet will periodically refresh a reporting unit’s fair value measurement and this is based on a number of factors, including how much fair value exceeded carrying value in the most recent quantitative assessment and the reporting unit’s recent performance. Our policy is that a quantitative impairment test be performed for each reporting unit at least once during every three-year period. For those reporting units where a qualitative assessment is either not performed or for which the conclusion is that an impairment is more likely than not, a quantitative impairment test will be performed. Other Intangible Assets. Intangible assets with indefinite useful lives are not amortized while intangible assets with finite useful lives are amortized generally on a straight-line basis over the periods benefited. The following table details the weighted-average useful lives of software and other intangible assets by reporting segment (numbers in years): Software Other intangible assets Engine Products 7 33 Fastening Systems 5 23 Engineered Structures 3 18 Forged Wheels 4 25 Leases. The Company determines whether a contract contains a lease at inception. The Company leases land and buildings, plant equipment, vehicles, and computer equipment which have been classified as operating leases. Certain real estate leases include one or more options to renew; the exercise of lease renewal options is at the Company’s discretion. The Company includes renewal option periods in the lease term when it is determined that the options are reasonably certain to be exercised. Certain of Howmet’s real estate lease agreements include rental payments that either have fixed contractual increases over time or adjust periodically for inflation. Certain of the Company’s lease agreements include variable lease payments. The variable portion of payments is not included in the initial measurement of the right-of-use asset or lease liability due to the uncertainty of the payment amount and is recorded as lease cost in the period incurred. The Company also rents or subleases certain real estate to third parties, which is not material to the consolidated financial statements. Operating lease right-of-use assets and lease liabilities with an initial term greater than 12 months are recorded on the balance sheet at the present value of the future minimum lease payments over the lease term at the lease commencement date and are recognized as lease expense on a straight-line basis over the lease term. The Company uses an incremental collateralized borrowing rate based on the information available at the lease commencement date in determining the present value of future payments, as most of its leases do not provide an implicit rate. The operating lease right-of-use assets also include any lease prepayments made and are reduced by lease incentives and accrued exit costs. Environmental Matters. Expenditures for current operations are expensed or capitalized, as appropriate. Expenditures relating to existing conditions caused by past operations, which will not contribute to future sales, are expensed. Liabilities are recorded when remediation costs are probable and can be reasonably estimated. The liability may include costs such as site investigations, consultant fees, feasibility studies, outside contractors, and monitoring expenses. Estimates are generally not discounted or reduced by potential claims for recovery. Claims for recovery are recognized when probable and as agreements are reached with third parties. The estimates also include costs related to other potentially responsible parties to the extent that Howmet has reason to believe such parties will not fully pay their proportionate share. The liability is continuously reviewed and adjusted to reflect current remediation progress, prospective estimates of required activity, and other factors that may be relevant, including changes in technology or regulations. Litigation and Contingent Liabilities. From time to time, we are involved in various lawsuits, claims, investigations, and proceedings. These matters may include speculative claims for substantial or indeterminate amounts of damages. Management determines the likelihood of an unfavorable outcome based on many factors, such as the nature of the matter, available defenses and case strategy, progress of the matter, views and opinions of legal counsel and other advisors, applicability and success of appeals processes, and the outcome of similar historical matters, among others. If an unfavorable outcome is deemed probable and the amount of the potential loss can be estimated, the most reasonable loss estimate is recorded. If an unfavorable outcome of a matter is deemed probable but the loss is not reasonably estimable, or if an unfavorable outcome is deemed reasonably possible, then the matter is disclosed but no liability is recorded. Legal matters are reviewed on a continuous basis to determine if there has been a change in management’s judgment regarding the likelihood of an unfavorable outcome or the estimate of a potential loss. Revenue Recognition. The Company's contracts with customers are comprised of acknowledged purchase orders incorporating the Company’s standard terms and conditions, or for larger customers, may also generally include terms under negotiated multi-year agreements. These contracts with customers typically consist of the manufacturing of products which represent single performance obligations that are satisfied upon transfer of control of the product to the customer. The Company produces fastening systems; seamless rolled rings; investment castings, including airfoils; extruded, machined and formed aircraft parts; and forged aluminum commercial vehicle wheels. Transfer of control is assessed based on alternative use of the products we produce and our enforceable right to payment for performance to date under the contract terms. Transfer of control and revenue recognition generally occur upon shipment or delivery of the product, which is when title, ownership and risk of loss pass to the customer and is based on the applicable shipping terms. The shipping terms vary across all businesses and depend on the product, the country of origin, and the type of transportation (truck, train, or vessel). An invoice for payment is issued at the time of shipment. Our segments set commercial terms on which Howmet sells products to its customers. These terms are influenced by industry custom, market conditions, product line (specialty versus commodity products), and other considerations. In certain circumstances, Howmet receives advanced payments from its customers for product to be delivered in future periods. These advanced payments are recorded as deferred revenue until the product is delivered and title and risk of loss have passed to the customer in accordance with the terms of the contract. Deferred revenue was $60 and $64 as of December 31, 2024 and 2023, respectively, and is included in Other current liabilities and Other noncurrent liabilities and deferred credits in the Consolidated Balance Sheet. Income Taxes. The provision for income taxes is determined using the asset and liability approach of accounting for income taxes. Under this approach, the provision for income taxes represents income taxes paid or payable (or received or receivable) for the current year plus the change in deferred taxes during the year. Deferred taxes represent the future tax consequences expected to occur when the reported amounts of assets and liabilities are recovered or paid, and result from differences between the financial and tax bases of Howmet’s assets and liabilities and are adjusted for changes in tax rates and tax laws when enacted. Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not (greater than 50%) that a tax benefit will not be realized. In evaluating the need for a valuation allowance, management considers all potential sources of taxable income, including income available in carryback periods, future reversals of taxable temporary differences, projections of taxable income, and income from tax planning strategies, as well as all available positive and negative evidence. Positive evidence includes factors such as a history of profitable operations, projections of future profitability within the carryforward period, including from tax planning strategies, and Howmet’s experience with similar operations. Existing favorable contracts and the ability to sell products into established markets are additional positive evidence. Negative evidence includes items such as cumulative losses, projections of future losses, or carryforward periods that are not long enough to allow for the utilization of a deferred tax asset based on existing projections of income. Deferred tax assets for which no valuation allowance is recorded may not be realized upon changes in facts and circumstances, resulting in a future charge to establish a valuation allowance. Existing valuation allowances are re-examined under the same standards of positive and negative evidence. If it is determined that it is more likely than not that a deferred tax asset will be realized, the appropriate amount of the valuation allowance, if any, is released. Deferred tax assets and liabilities are also remeasured to reflect changes in underlying tax rates due to law changes and the granting and lapse of tax holidays. It is Howmet’s policy to apply a tax law ordering approach when considering the need for a valuation allowance on net operating losses expected to offset Global Intangible Low-Taxed Income (“GILTI”) inclusions. Under this approach, reductions in cash tax savings are not considered as part of the valuation allowance assessment. Instead, future GILTI inclusions are considered a source of taxable income that support the realizability of deferred tax assets. It is Howmet’s policy to treat taxes due from future inclusions in United States (“U.S.”) taxable income related to GILTI as a current period expense when incurred. Tax benefits related to uncertain tax positions taken or expected to be taken on a tax return are recorded when such benefits meet a more likely than not threshold. Otherwise, these tax benefits are recorded when a tax position has been effectively settled, which means that the statute of limitations has expired or the appropriate taxing authority has completed their examination even though the statute of limitations remains open. Interest and penalties related to uncertain tax positions are recognized as part of the provision for income taxes and are accrued beginning in the period that such interest and penalties would be applicable under relevant tax law until such time that the related tax benefits are recognized. Stock-Based Compensation. Howmet recognizes compensation expense for employee equity grants using the non-substantive vesting period approach, in which the expense is recognized ratably over the requisite service period based on the grant date fair value. Forfeitures are accounted for as they occur. For restricted stock unit awards, the fair value is equivalent to the closing market price of Howmet’s common stock on the date of grant. The fair value of performance awards containing a market condition is valued using a Monte Carlo valuation model. Determining the fair value at the grant date requires judgment, including estimates for the average risk-free interest rate, dividend yield, volatility, and exercise behavior. These assumptions may differ significantly between grant dates because of changes in the actual results of these inputs that occur over time. Foreign Currency. The local currency is the functional currency for Howmet’s significant operations outside the U.S., except for certain operations in Canada and the United Kingdom (“U.K.”), where the U.S. dollar is used as the functional currency. The determination of the functional currency for Howmet’s operations is made based on the appropriate economic and management indicators. Derivatives and Hedging. Derivatives are held for purposes other than trading and are part of a formally documented risk management program. The Company uses commodity derivative financial instruments to manage its economic risk. For interest rate exposures, we may use interest rate swaps and cross-currency swaps to effect a fixed rate payment and hedge the variability in future payment changes. The Company records derivative instruments on its consolidated balance sheets at fair value and evaluates hedge effectiveness when electing to apply hedge accounting. When electing to apply hedge accounting, the Company formally documents all derivative hedges at inception and the underlying hedged items, as well as the risk management objectives and strategies for undertaking the hedge transaction. For derivatives and debt instruments that are designated and qualify for hedge accounting, changes in the fair value are recorded in Accumulated other comprehensive income (loss). Derivatives that are designated as cash flow hedges are recorded in Accumulated other comprehensive income (loss) and reclassified to the Consolidated Statements of Operations when the effects of the item being hedged are recognized in the Consolidated Statements of Operations. The remeasurements of debt instruments designated as net investment hedges are recorded in Accumulated other comprehensive income (loss) and will be reclassified to earnings only upon the sale or liquidation of the Company’s hedged net investment. Cash flows from derivatives are recognized in the Statement of Consolidated Cash Flows in a manner consistent with the underlying transactions. Acquisitions. Howmet’s business acquisitions are accounted for using the acquisition method. The purchase price is allocated to the assets acquired and liabilities assumed based on their estimated fair values. Any excess purchase price over the fair value of the net assets acquired is recorded as goodwill. For all acquisitions, operating results are included in the Statement of Consolidated Operations from the date of the acquisition. Discontinued Operations and Assets Held for Sale. For those businesses where management has committed to a plan to divest, each business is valued at the lower of its carrying amount or estimated fair value less cost to sell. If the carrying amount of the business exceeds its estimated fair value, an impairment loss is recognized. Fair value is estimated using accepted valuation techniques such as a DCF model, valuations performed by third parties, earnings multiples, or indicative bids, when available. A number of significant estimates and assumptions are involved in the application of these techniques, including the forecasting of markets and market share, sales volumes and prices, costs and expenses, and multiple other factors. Management considers historical experience and all available information at the time the estimates are made; however, the fair value that is ultimately realized upon the divestiture of a business may differ from the estimated fair value reflected in the Consolidated Financial Statements. Depreciation and amortization expense is not recorded on assets of a business to be divested once they are classified as held for sale. Businesses to be divested are generally classified in the Consolidated Financial Statements as either discontinued operations or held for sale. For businesses classified as discontinued operations, the balance sheet amounts and results of operations are reclassified from their historical presentation to assets and liabilities of discontinued operations on the Consolidated Balance Sheet and to discontinued operations on the Statement of Consolidated Operations, respectively, for all periods presented. The gains or losses associated with these divested businesses are recorded in discontinued operations on the Statement of Consolidated Operations. The Statement of Consolidated Cash Flows is not required to be reclassified for discontinued operations for any period. Segment information does not include the assets or operating results of businesses classified as discontinued operations for all periods presented. These businesses are expected to be disposed of within one year. For businesses classified as held for sale that do not qualify for discontinued operations treatment, the balance sheet and cash flow amounts are reclassified from their historical presentation to assets and liabilities of operations held for sale for all periods presented. The results of operations continue to be reported in continuing operations. The gains or losses associated with these divested businesses are recorded in Restructuring and other charges on the Statement of Consolidated Operations. The segment information includes the assets and operating results of businesses classified as held for sale for all periods presented.

Recently Adopted and Recently I

Recently Adopted and Recently Issued Accounting Guidance	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Recently Adopted and Recently Issued Accounting Guidance	Recently Adopted and Recently Issued Accounting Guidance Recently Adopted Accounting Guidance. In November 2023, the Financial Accounting Standards Board (“FASB”) issued guidance to enhance disclosures related to significant segment expenses and other matters related to reportable segments. These changes become effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The adoption of this new disclosure is reflected in Note C of the Consolidated Financial Statements. In September 2022, the FASB issued guidance to enhance the transparency of disclosures regarding supplier finance programs. These changes became effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, except for the amendment on rollforward information, which is effective for fiscal years beginning after December 15, 2023. The adoption of this new disclosure is reflected in Note S of the Consolidated Financial Statements. Recently Issued Accounting Guidance. In November 2024, the FASB issued guidance to improve disclosures about an entity’s expenses including more detailed information about the components of expenses in commonly presented expense captions. These changes become effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Management is currently evaluating the impact of these changes on the Consolidated Financial Statements. In December 2023, the FASB issued guidance to enhance the transparency of income tax disclosures including additional details on the rate reconciliation and taxes paid by jurisdiction. These changes become effective for fiscal years beginning after December 15, 2024. Management is currently evaluating the impact of these changes on the Consolidated Financial Statements.

Segment and Geographic Area Inf

Segment and Geographic Area Information	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Segment and Geographic Area Information	Segment and Geographic Area Information Howmet is a global leader in lightweight metals engineering and manufacturing. Howmet’s innovative, multi-material products, which include nickel, titanium, aluminum, and cobalt, are used worldwide in the aerospace (commercial and defense), commercial transportation, and industrial and other markets. Segment performance under Howmet’s management reporting system is evaluated based on Segment Adjusted EBITDA. The Company’s Chief Executive Officer, who has been determined to be our Chief Operating Decision Maker (“CODM”), believes that Segment Adjusted EBITDA provides information with respect to the Company’s operating performance and the Company’s ability to meet its financial obligations. Howmet’s definition of Segment Adjusted EBITDA (Earnings before interest, taxes, depreciation, and amortization) is net margin plus an add-back for depreciation and amortization. Net margin is equivalent to Sales minus the following items: Cost of goods sold; Selling, general administrative, and other expenses; Research and development (“R&D”) expenses; and Provision for depreciation and amortization. Special items, including Restructuring and other charges, are excluded from net margin and Segment Adjusted EBITDA. The Company’s CODM considers forecast-to-actual variances for Segment Adjusted EBITDA when allocating resources across the Company’s reportable segments. Segment Adjusted EBITDA may not be comparable to similarly titled measures of other companies. Differences between the total segment and consolidated totals are in Corporate. Howmet’s operations consist of four worldwide reportable segments as follows: Engine Products Engine Products produces investment castings, including airfoils, and seamless rolled rings primarily for aircraft engines and industrial gas turbine applications. Engine Products produces rotating parts as well as structural parts. Fastening Systems Fastening Systems produces aerospace fastening systems, as well as commercial transportation, industrial and other fasteners. The business’s high-tech, multi-material fastening systems are found nose to tail on aircraft and aero engines. Fastening Systems’ products are also critical components of commercial transportation vehicles, and construction, industrial, and renewable energy equipment. Engineered Structures Engineered Structures produces titanium ingots and mill products for aerospace and defense applications and is vertically integrated to produce titanium forgings, titanium extrusions, and machining services for airframe, wing, aero-engine, and landing gear components. Engineered Structures also produces aluminum forgings, nickel forgings, and aluminum machined components and assemblies for aerospace and defense applications. Forged Wheels Forged Wheels provides forged aluminum wheels and related products for heavy-duty trucks and the commercial transportation market. The operating results and assets of the Company's reportable segments were as follows: Year ended Engine Products Fastening Systems Engineered Structures Forged Wheels Total 2024 Sales: Third-party sales $ 3,735 $ 1,576 $ 1,065 $ 1,054 $ 7,430 Inter-segment sales 7 1 10 — 18 Total sales $ 3,742 $ 1,577 $ 1,075 $ 1,054 $ 7,448 Expenses: Segment Adjusted cost of goods sold (1) $ 2,495 $ 1,061 $ 873 $ 724 $ 5,153 Other segment items (2) 97 110 36 43 286 Profit and loss: Segment Adjusted EBITDA $ 1,150 $ 406 $ 166 $ 287 $ 2,009 Restructuring and other charges 1 5 12 1 19 Provision for depreciation and amortization 139 47 42 42 270 Other: Capital expenditures $ 219 $ 26 $ 20 $ 45 $ 310 Total assets 5,145 2,711 1,355 701 9,912 2023 Sales: Third-party sales $ 3,266 $ 1,349 $ 878 $ 1,147 $ 6,640 Inter-segment sales 13 — 3 — 16 Total sales $ 3,279 $ 1,349 $ 881 $ 1,147 $ 6,656 Expenses: Segment Adjusted cost of goods sold (1) $ 2,295 $ 959 $ 720 $ 796 $ 4,770 Other segment items (2) 97 112 48 42 299 Profit and loss: Segment Adjusted EBITDA $ 887 $ 278 $ 113 $ 309 $ 1,587 Restructuring and other (credits) charges (2) 1 21 — 20 Provision for depreciation and amortization 130 46 47 39 262 Other: Capital expenditures $ 112 $ 31 $ 26 $ 36 $ 205 Total assets 4,926 2,749 1,415 724 9,814 2022 Sales: Third-party sales $ 2,698 $ 1,117 $ 790 $ 1,058 $ 5,663 Inter-segment sales 4 — 6 — 10 Total sales $ 2,702 $ 1,117 $ 796 $ 1,058 $ 5,673 Expenses: Segment Adjusted cost of goods sold (1) $ 1,881 $ 782 $ 644 $ 745 $ 4,052 Other segment items (2) 92 101 41 35 269 Profit and loss: Segment Adjusted EBITDA $ 729 $ 234 $ 111 $ 278 $ 1,352 Restructuring and other charges 29 8 7 2 46 Provision for depreciation and amortization 125 45 48 40 258 Other: Capital expenditures $ 94 $ 39 $ 17 $ 28 $ 178 Total assets 4,784 2,661 1,273 701 9,419 (1) Segment Adjusted cost of goods sold is exclusive of Provision for depreciation and amortization, Restructuring and other charges, and Corporate expenses. (2) Other segment items includes Selling, general administrative, and other expenses, and Research and development expenses; exclusive of Provision for depreciation and amortization, and Restructuring and other charges. The following table reconciles Total segment capital expenditures, which are presented on an accrual basis, with Capital expenditures as presented on the Statement of Consolidated Cash Flows. Differences between the total segment and consolidated totals are in Corporate, including the impact of changes in accrued capital expenditures during the period. For the year ended December 31, 2024 2023 2022 Total segment capital expenditures $ 310 $ 205 $ 178 Corporate 11 14 15 Capital expenditures $ 321 $ 219 $ 193 The following tables reconcile certain segment information to consolidated totals. Differences between the total segment and consolidated totals are in Corporate. For the year ended December 31, 2024 2023 2022 Total Segment Adjusted EBITDA $ 2,009 $ 1,587 $ 1,352 Segment provision for depreciation and amortization (270) (262) (258) Unallocated amounts: Restructuring and other charges ( D ) (21) (23) (56) Corporate expense (85) (99) (119) Operating income $ 1,633 $ 1,203 $ 919 Loss on debt redemption (6) (2) (2) Interest expense, net (182) (218) (229) Other expense, net ( F ) (62) (8) (82) Income before income taxes $ 1,383 $ 975 $ 606 December 31, 2024 2023 Assets: Total segment assets $ 9,912 $ 9,814 Unallocated amounts: Cash and cash equivalents 564 610 Deferred income taxes 36 46 Corporate fixed assets, net 83 83 Fair value of derivative contracts 4 — Accounts receivable securitization (250) (250) Other 170 125 Consolidated assets $ 10,519 $ 10,428 Segment assets include third-party receivables while the accounts receivable securitization item includes the impact of sold receivables under the Company’s Accounts Receivable securitization programs. See Note L for further details. Geographic information for sales was as follows (based upon the destination of the sale): For the year ended December 31, 2024 2023 2022 Sales: United States $ 3,713 $ 3,273 $ 2,928 France 678 578 394 Germany 458 363 292 Japan 355 378 319 United Kingdom 350 283 228 Italy 287 220 180 Mexico 220 263 235 Canada 174 145 138 Poland 152 130 96 China 103 98 111 Other 940 909 742 $ 7,430 $ 6,640 $ 5,663 Geographic information for long-lived tangible assets was as follows (based upon the physical location of the assets): December 31, 2024 2023 Long-lived assets: United States $ 1,864 $ 1,760 Hungary 199 200 United Kingdom 121 120 France 112 121 Mexico 68 71 Germany 54 58 China 41 46 Other 82 80 $ 2,541 $ 2,456 The following table disaggregates segment revenue by major market served. Differences between the total segment and consolidated totals are in Corporate. Engine Products Fastening Systems Engineered Structures Forged Wheels Total Year ended December 31, 2024 Aerospace - Commercial $ 2,091 $ 1,006 $ 774 $ — $ 3,871 Aerospace - Defense 766 162 236 — 1,164 Commercial Transportation — 254 — 1,054 1,308 Industrial and Other 878 154 55 — 1,087 Total end-market revenue $ 3,735 $ 1,576 $ 1,065 $ 1,054 $ 7,430 Year ended December 31, 2023 Aerospace - Commercial $ 1,798 $ 790 $ 641 $ — $ 3,229 Aerospace - Defense 670 173 172 — 1,015 Commercial Transportation — 255 — 1,147 1,402 Industrial and Other 798 131 65 — 994 Total end-market revenue $ 3,266 $ 1,349 $ 878 $ 1,147 $ 6,640 Year ended December 31, 2022 Aerospace - Commercial $ 1,495 $ 616 $ 495 $ — $ 2,606 Aerospace - Defense 526 158 239 — 923 Commercial Transportation — 225 — 1,058 1,283 Industrial and Other 677 118 56 — 851 Total end-market revenue $ 2,698 $ 1,117 $ 790 $ 1,058 $ 5,663 The Company derived 68%, 64%, and 62% of its revenue from the aerospace (commercial and defense) markets for the years ended December 31, 2024, 2023, and 2022, respectively. On April 2, 2024, General Electric Company, one of our largest customers, completed the spin-off of its energy-focused business into GE Vernova, a new publicly traded company. Since then, General Electric Company operates as GE Aerospace. RTX Corporation and GE Aerospace each represented approximately 10% of the Company’s third-party sales for the year ended December 31, 2024. These sales were primarily from the Engine Products segment.

Restructuring and Other Charges

Restructuring and Other Charges	12 Months Ended
	Dec. 31, 2024
Restructuring and Related Activities [Abstract]
Restructuring and Other Charges	Restructuring and Other Charges Restructuring and other charges were comprised of the following: For the year ended December 31, 2024 2023 2022 Layoff costs $ 10 $ 3 $ — Net reversals of previously recorded layoff reserves (3) (1) (1) Pension and other post-retirement benefits - net settlements ( G ) — 5 58 Non-cash asset impairments and accelerated depreciation 2 14 1 Net losses (gains) related to divestitures of assets and businesses ( T ) 12 (1) (8) Other — 3 6 Total restructuring and other charges $ 21 $ 23 $ 56 Layoff costs were recorded based on approved, detailed action plans submitted by the operating locations that specified positions to be eliminated, benefits to be paid under existing severance plans, union contracts, or statutory requirements and the expected timetable for completion of the plans. 2024 Actions. In 2024, Howmet recorded Restructuring and other charges of $21, which were primarily due to a net loss on the sale of a small U.K. manufacturing facility in Engineered Structures of $13, a $10 charge for layoff costs, including the separation of 431 employees (283 in Fastening Systems, 111 in Engineered Structures and 37 in Forged Wheels), and accelerated depreciation, of $2, partially offset by the reversal of $3 for layoff reserves in Engineered Structures related to prior periods and a gain on the sale of assets at a small U.K. manufacturing facility in Engine Products of $1. As of December 31, 2024, 355 employees of the 431 employees were separated. The remaining separations for the 2024 restructuring programs are expected to be completed in 2025. 2023 Actions. In 2023, Howmet recorded Restructuring and other charges of $23, which included a $12 charge for impairment of assets primarily related to decommissioned fixed assets in Engineered Structures; a $5 charge for U.S. and Canadian pension plans’ settlement accounting; a $3 charge for layoff costs, including the separation of 63 employees in Engineered Structures; a $3 charge for various other exit costs primarily for the closures of small manufacturing facilities and a $2 charge for accelerated depreciation primarily related to the closure of a small Engineered Structures facility in the U.K. These charges were partially offset by a gain of $1 on the sale of assets at a U.S. Engineered Structures facility and a benefit of $1 related to the reversal of layoff reserves related to prior periods. As of December 31, 2024 , actions related to the 2023 restructuring programs were complete. 2022 Actions. In 2022, Howmet recorded Restructuring and other charges of $56, which included a $58 charge for U.S. and U.K. pension plans’ settlement accounting; a $6 charge for various other exit costs; and a $1 charge for accelerated depreciation primarily related to the closure of small U.S. manufacturing facilities in Engineered Structures. These charges were partially offset by a gain of $8 on the sale of assets at a small U.S. manufacturing facility in Engine Products and a benefit of $1 related to the reversal of a number of layoff reserves related to prior periods. As of December 31, 2024 , actions related to the 2022 restructuring programs were complete. Activity and reserve balances for restructuring charges were as follows: Layoff Other Total Reserve balances at December 31, 2021 $ 17 $ 2 $ 19 2022 Activity Cash payments (9) (7) (16) Restructuring and other charges 56 — 56 Other (1) (58) 7 (51) Reserve balances at December 31, 2022 $ 6 $ 2 $ 8 2023 Activity Cash payments $ (3) $ (3) $ (6) Restructuring and other charges 7 16 23 Other (2) (5) (13) (18) Reserve balances at December 31, 2023 $ 5 $ 2 $ 7 2024 Activity Cash payments $ (8) $ (2) $ (10) Restructuring and other charges 7 14 21 Other (3) — (14) (14) Reserve balances at December 31, 2024 $ 4 $ — $ 4 (1) In 2022, other for layoff costs included $58 in settlement accounting charges related to U.S. and U.K. pension plans; while other for other exit costs included a gain of $8 on the sale of assets, which was offset by a $1 charge for accelerated depreciation. (2) In 2023, other for layoff costs included $5 in settlement accounting charges related to U.S. and Canadian pension plans; while other for other exit costs included charges of $12 related to the impairment of assets and a $2 charge for accelerated depreciation which was offset by a gain of $1 on the sale of assets. (3) In 2024, other for other exit costs included a net loss of $13 on the sale of a small U.K. manufacturing facility and a charge of $2 for accelerated depreciation, partially offset by a gain on the sale of assets at a small U.K. manufacturing facility in Engine Products of $1. The remaining reserves as of December 31, 2024 are expected to be paid in cash during 2025 .

Interest Cost Components

Interest Cost Components	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Interest Cost Components	Interest Cost Components For the year ended December 31, 2024 2023 2022 Amount charged to interest expense, net $ 182 $ 218 $ 229 Loss on debt redemption ( Q ) 6 2 2 Amount capitalized 7 6 6 Total interest cost $ 195 $ 226 $ 237

Other Expense, Net

Other Expense, Net	12 Months Ended
	Dec. 31, 2024
Other Income and Expenses [Abstract]
Other Expense, Net	Other Expense, Net For the year ended December 31, 2024 2023 2022 Non-service costs - pension and other postretirement benefits ( G ) $ 29 $ 29 $ 16 Interest income (20) (23) (6) Foreign currency losses (gains), net 13 (2) (1) Net realized and unrealized losses (1) 25 22 18 Deferred compensation 15 10 (8) Legal proceeding (2) — (25) 65 Other, net — (3) (2) Total other expense, net $ 62 $ 8 $ 82 (1) In all periods presented, Net realized and unrealized losses primarily includes costs associated with sales under the Company’s accounts receivables securitization arrangement and sales of other customer receivables (See Note L ). (2) In 2023, due to the final settlement of the Lehman Brothers International (Europe) legal proceeding (See Note U ) , L egal proceeding included the reversal of $25, net of legal fees of $1, of the $65 pre-tax charge taken in 2022.

Pension and Other Postretiremen

Pension and Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Pension and Other Postretirement Benefits	Pension and Other Postretirement Benefits Howmet maintains pension plans covering U.S. employees and certain employees in foreign locations. Defined pension benefits generally depend on length of service and job grade. The majority of benefits are paid through pension trusts that are sufficiently funded to ensure that all plans can pay benefits to retirees as they become due. Most salaried and non-bargaining hourly U.S. employees hired after March 1, 2006 participate in a defined contribution plan instead of a defined benefit plan. Howmet also maintains health care and life insurance postretirement benefit plans covering eligible U.S. retired employees. Generally, the medical plans are unfunded and pay a percentage of medical expenses, reduced by deductibles and other coverage. Life benefits are generally provided by insurance contracts. Howmet retains the right, subject to existing agreements, to change or eliminate these benefits. Effective May 1, 2019, salaried and non-bargaining hourly U.S. employees and retirees are not eligible for postretirement life insurance benefits. Effective July 1, 2024, salaried and non-bargaining hourly U.S. employees are not eligible for any postretirement medical benefits. In 2023 and 2022, the Company applied settlement accounting to certain U.S., U.K., and Canadian pension plans due to lump sum payments to participants, which resulted in settlement charges of $2 and $17 , respectively, that were recorded in Restructuring and other charges. In May and July 2023, Howmet entered into new collective bargaining agreements with the United Autoworkers and United Steel Workers, respectively. These agreements amended the existing health and welfare plans, resulting in an adjustment to the Company’s Accrued other postretirement benefits liability of $10, which was offset in Accumulated other comprehensive loss. In June 2023, the Company undertook additional actions to reduce U.S. gross pension obligations by $19 by purchasing group annuity contracts with a third-party carrier to pay and administer future annuity payments. These actions resulted in a settlement charge of $3 and were recorded in Restructuring and other charges in the second quarter ended June 30, 2023 in the Statement of Consolidated Operations. The funded status of the plans have not been significantly impacted. In 2022, a certain U.S. pension plan attained funding levels that allowed full lump sum payments. These payments resulted in settlement charges of $41 that were recorded in Restructuring and other charges in the Statement of Consolidated Operations. In December 2022, the Canadian pension plan was amended to provide for termination of the plan. As a result, the Company recognized a reduction of $2 in the pension benefit obligation through curtailment, which was offset in Accumulated other comprehensive loss in the Consolidated Balance Sheet. The wind-up efforts and satisfaction of all plan liabilities are expected to be completed in 2025. Obligations and Funded Status Pension benefits Other December 31, 2024 2023 2024 2023 Change in benefit obligation Benefit obligation at beginning of year $ 1,592 $ 1,599 $ 103 $ 120 Service cost 3 3 1 1 Interest cost 75 80 5 7 Amendments — — (2) (10) Actuarial (gains) losses (1) (58) 50 (36) (1) Settlements — (31) — — Benefits paid (112) (118) (11) (14) Foreign currency translation impact (4) 9 — — Benefit obligation at end of year (2) $ 1,496 $ 1,592 $ 60 $ 103 Change in plan assets (2) Fair value of plan assets at beginning of year $ 925 $ 970 $ — $ — Actual (loss) return on plan assets (8) 57 — — Employer contributions 79 36 — — Benefits paid (95) (101) — — Administrative expenses (12) (13) — — Settlement payments — (32) — — Foreign currency translation impact (3) 8 — — Fair value of plan assets at end of year (2) $ 886 $ 925 $ — $ — Funded status $ (610) $ (667) $ (60) $ (103) Amounts recognized in the Consolidated Balance Sheet consist of: Noncurrent assets $ 31 $ 13 $ — $ — Current liabilities (16) (16) (6) (11) Noncurrent liabilities (625) (664) (54) (92) Net amount recognized $ (610) $ (667) $ (60) $ (103) Amounts recognized in Accumulated Other Comprehensive Loss consist of: Net actuarial loss (gain) $ 956 $ 960 $ (59) $ (26) Prior service cost (benefit) 2 2 (33) (41) Net amount recognized, before tax effect $ 958 $ 962 $ (92) $ (67) Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of: Net actuarial cost (benefit) $ 28 $ 86 $ (36) $ (1) Amortization of accumulated net actuarial (loss) benefit (32) (33) 3 3 Prior service benefit — — (2) (10) Amortization of prior service benefit — — 10 9 Net amount recognized, before tax effect $ (4) $ 53 $ (25) $ 1 (1) As of December 31, 2024, the actuarial gains impacting the benefit obligation were primarily due to changes in the discount rate, partially offset by asset returns being lower than expected. At December 31, 2023, the actuarial losses impacting the benefit obligation were primarily due to changes in the discount rate as well as asset returns being lower than expected. (2) As of December 31, 2024, the benefit obligation, fair value of plan assets, and funded status for U.S. pension plans were $1,356, $739, and $(617), respectively. As of December 31, 2023, the benefit obligation, fair value of plan assets, and funded status for U.S. pension plans were $1,434, $780, and $(654), respectively. Pension Plan Benefit Obligations Pension benefits 2024 2023 The projected benefit obligation and accumulated benefit obligation for all defined benefit pension plans were as follows: Projected benefit obligation $ 1,496 $ 1,592 Accumulated benefit obligation 1,495 1,591 The aggregate projected benefit obligation and fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets were as follows: Projected benefit obligation 1,380 1,459 Fair value of plan assets 739 780 The aggregate accumulated benefit obligation and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets were as follows: Accumulated benefit obligation 1,379 1,459 Fair value of plan assets 739 780 Components of Net Periodic Benefit Cost Pension benefits (1) Other postretirement benefits For the year ended December 31, 2024 2023 2022 2024 2023 2022 Service cost $ 3 $ 3 $ 4 $ 1 $ 1 $ 2 Interest cost 75 80 51 5 7 4 Expected return on plan assets (70) (74) (80) — — — Recognized net actuarial loss (gain) 32 28 49 (3) (3) 1 Amortization of prior service benefit — — — (10) (9) (9) Settlements (2) — 5 58 — — — Net periodic benefit cost (3) $ 40 $ 42 $ 82 $ (7) $ (4) $ (2) (1) In 2024, 2023, and 2022, net periodic benefit cost for U.S. pension plans was $40, $40, and $79, respectively. (2) In 2023, settlements were related to U.S. and Canadian actions including an annuity buyout and lump sum benefit payments. In 2022, settlements were related to U.S. and U.K. lump sum benefit payments. (3) Service cost was included within Cost of goods sold and Selling, general administrative, and other expenses; settlements were included in Restructuring and other charges; all other cost components were recorded in Other expense, net in the Statement of Consolidated Operations. Assumptions Weighted average assumptions used to determine benefit obligations for pension and other postretirement benefit plans were as follows: December 31, 2024 2023 Discount rate 5.60 % 5.10 % Cash balance plan interest crediting rate 3.00 % 3.00 % The U.S. discount rate is determined using a Company-specific yield curve model (above-median) developed with the assistance of an external actuary, while both the U.K. and Canada utilize models developed internally by their respective actuary. The cash flows of the plans’ projected benefit obligations are discounted using a single equivalent rate derived from yields on high quality corporate bonds, which represent a broad diversification of issuers in various sectors, including finance and banking, industrials, transportation, and utilities, among others. The yield curve models parallel the plans’ projected cash flows, which have a global average duration o f 9 years. The underlying cash flows of the bonds included in the models exceed the cash flows needed to satisfy the Company’s plans’ obligations multiple times. Benefit accruals for future compensation under the Company’s major salaried and non-bargained hourly defined benefit pension plans have ceased. The rate of compensation increase no longer impacts the determination of the benefit obligation. Weighted average assumptions used to determine net periodic benefit cost for pension and other postretirement benefit plans were as follows: 2024 2023 2022 Discount rate to calculate service cost (1) 5.10 % 5.50 % 2.80 % Discount rate to calculate interest cost (1) 4.90 % 5.30 % 2.50 % Expected long-term rate of return on plan assets 6.70 % 6.70 % 6.70 % Cash balance plan interest crediting rate 3.00 % 3.00 % 3.00 % (1) In all periods presented, the respective global discount rates were used to determine net periodic benefit cost for most pension plans for the full annual period. The discount rates for certain plans were updated during 2024, 2023, and 2022 to reflect the remeasurement of these plans due to amendments, settlements, and/or curtailments. The weighted-average rates reflecting these remeasurements does not significantly differ from the rates presented. The expected long-term rate of return on plan assets (“EROA”) is generally applied to a five-year market-related value of plan assets. The process used by management to develop this assumption is one that relies on a combination of historical asset return information and forward-looking returns by asset class. As it relates to historical asset return information, management focuses on various historical moving averages when developing this assumption. While consideration is given to recent performance and historical returns, the assumption represents a long-term, prospective return. Management also incorporates expected future returns on current and planned asset allocations using information from various external investment managers and consultants, as well as management’s own judgment. For 2025, management anticipates that approximately 7% will continue to be the expected long-term rate of return for global plan assets. EROA assumptions are developed by country. Annual changes in the weighted average EROA are impacted by the relative size of the assets by country. For 2024, 2023, and 2022, the U.S. expected long-term rate of return used by management was based on the prevailing and planned strategic asset allocations, as well as estimates of future returns by asset class. These rates were within the respective range of the 20-year moving average of actual performance and the expected future returns developed by asset class. Assumed health care cost trend rates for U.S. other postretirement benefit plans were as follows: 2024 2023 2022 Health care cost trend rate assumed for next year 5.50 % 5.50 % 5.50 % Rate to which the cost trend rate gradually declines 4.50 % 4.50 % 4.50 % Year that the rate reaches the rate at which it is assumed to remain 2027 2026 2025 The assumed health care cost trend rate is used to measure the expected cost of gross eligible charges covered by Howmet’s other postretirement benefit plans. For 2025, a 5.50% trend rate will be used, reflecting management’s best estimate of the change in future health care costs covered by the plans. The plans’ actual annual health care cost trend experience over the past three years has ranged from (0.40)% to 1.50%. Management’s best estimate considering actual and expected annual health care costs is to maintain the 5.50% trend rate as indicative of expected increases for future health care costs over the long-term. Plan Assets Howmet’s pension plans’ investment policy as of December 31, 2024 by asset class, were as follows: Asset class Policy range (1) Equities 20–55% Fixed income 25–55% Other investments 15–35% (1) Policy range is for U.S. plan assets only, as both the U.K. and Canadian asset investment allocations are controlled by a third-party trustee with input from Howmet. The principal objectives underlying the investment of the pension plans’ assets are to ensure that Howmet can properly fund benefit obligations as they become due under a broad range of potential economic and financial scenarios, maximize the long-term investment return with an acceptable level of risk based on such obligations, and broadly diversify investments across and within various asset classes to protect asset values against adverse movements. Specific objectives for long-term investment strategy include reducing the volatility of pension assets relative to pension liabilities and attaining and maintaining a sufficiently funded status. The use of derivative instruments is permitted where appropriate and necessary for achieving overall investment policy objectives. The investment strategy uses long duration bonds and derivative instruments to offset a portion of the interest rate sensitivity of U.S. pension liabilities. Exposure to broad equity risk is decreased and diversified through investments in hedge funds, private equity, private credit, private real estate, high-yield bonds, global and emerging market debt, and global and emerging market equities. Investments are further diversified by strategy, asset class, geography, and sector to enhance returns and mitigate downside risk. A large number of external investment managers are used to gain broad exposure to the financial markets and to mitigate manager-concentration risk. Investment practices comply with the requirements of the Employee Retirement Income Security Act (“ERISA”) and other applicable laws and regulations. The following section describes the valuation methodologies used to measure the fair value of pension plan assets, including an indication of the level in the fair value hierarchy in which each type of asset is generally classified (See Note R for the definition of fair value and a description of the fair value hierarchy). Equities. These securities consist of: (i) direct investments in the stock of publicly traded U.S. and non-U.S. companies that are valued based on the closing price reported in an active market on which the individual securities are traded (generally classified in Level 1); (ii) the plans’ share of commingled funds that are invested in the stock of publicly traded companies and are valued at the net asset value of shares held at December 31 (included in Level 1 and Level 2); and (iii) direct investments in long/short equity hedge funds and private equity (limited partnerships and venture capital partnerships) that are valued at net asset value. Fixed income. These securities consist of: (i) U.S. government debt that are generally valued using quoted prices (included in Level 1); (ii) cash and cash equivalents invested in publicly-traded funds and are valued based on the closing price reported in an active market on which the individual securities are traded (generally classified in Level 1); (iii) publicly traded U.S. and non-U.S. fixed interest obligations (principally corporate bonds and debentures) and are valued through consultation and evaluation with brokers in the institutional market using quoted prices and other observable market data (included in Level 2); (iv) fixed income derivatives that are generally valued using industry standard models with market-based observable inputs (included in Level 2); and (v) cash and cash equivalents invested in institutional funds and are valued at net asset value. Other investments. These investments include, among others: (i) real estate investment trusts that are valued based on the quoted prices and other observable market data (included in Level 2) and (ii) direct investments of discretionary and systematic macro hedge funds and private real estate (includes limited partnerships) that are valued at net asset value. The fair value methods described above may not be indicative of net realizable value or reflective of future fair values. Additionally, while Howmet believes the valuation methods used by the plans’ trustees are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date. The following table presents the fair value of pension plan assets classified under the appropriate level of the fair value hierarchy or net asset value: December 31, 2024 Level 1 Level 2 Net Asset Value Total Equities: Equity securities $ 1 $ 130 $ 300 $ 431 Long/short equity hedge funds — — 20 20 Private equity — — 112 112 $ 1 $ 130 $ 432 $ 563 Fixed income: Intermediate and long duration government/credit $ 71 $ 57 $ — $ 128 Other 18 66 — 84 $ 89 $ 123 $ — $ 212 Other investments: Real estate $ — $ 1 $ 54 $ 55 Discretionary and systematic macro hedge funds — — 40 40 Other — — 5 5 $ — $ 1 $ 99 $ 100 Net plan assets (1) $ 90 $ 254 $ 531 $ 875 December 31, 2023 Level 1 Level 2 Net Asset Value Total Equities: Equity securities $ — $ 85 $ 225 $ 310 Long/short equity hedge funds — — 18 18 Private equity — — 108 108 $ — $ 85 $ 351 $ 436 Fixed income: Intermediate and long duration government/credit $ 199 $ 151 $ — $ 350 Other 6 63 — 69 $ 205 $ 214 $ — $ 419 Other investments: Real estate $ — $ 5 $ 68 $ 73 Discretionary and systematic macro hedge funds — — 29 29 Other — — 3 3 $ — $ 5 $ 100 $ 105 Net plan assets (2) $ 205 $ 304 $ 451 $ 960 (1) As of December 31, 2024, the total fair value of pension plans’ assets excludes a net receivable of $11, which represents securities purchased and sold but not yet settled plus interest and dividends earned on various investments. (2) As of December 31, 2023, the total fair value of pension plans’ assets excludes a net payable of $35, which represents securities purchased and sold but not yet settled offset by interest and dividends earned on various investments. Funding and Cash Flows It is Howmet’s policy to fund amounts for pension plans sufficient to meet the minimum requirements set forth in the benefits laws and tax laws of the applicable country. Periodically, Howmet contributes additional amounts as deemed appropriate. In 2024 and 2023 , cash contributions to Howmet’s pension plans were $79 and $36, respectively. The contributions to the Company’s pension plans in 2025 are estimated to be $60 (of w hich $44 is for U.S. plans). Benefit payments expected to be paid to pension and other postretirement benefit plans’ participants utilizing the current assumptions outlined above are as follows: For the year ended December 31, Pension Other post- 2025 $ 138 $ 6 2026 133 6 2027 131 6 2028 131 6 2029 126 6 2030 - 2034 576 26 Total $ 1,235 $ 56 Defined Contribution Plans Howmet sponsors savings and investment plans in various countries, primarily in the U.S. Howmet’s contributions and expenses related to these plans were $92, $82 , and $76 in 2024, 2023, and 2022, respectively. U.S. employees may contribute a portion of their compensation to the plans, and Howmet matches a portion of these contributions in equivalent form of the investments elected by the employee. Additionally, for certain U.S. employees, Howmet makes a contribution of either a percentage of applicable eligible compensation or per hour worked.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The components of income before income taxes were as follows: For the year ended December 31, 2024 2023 2022 United States $ 901 $ 538 $ 287 Foreign 482 437 319 Total $ 1,383 $ 975 $ 606 The provision for income taxes consisted of the following: For the year ended December 31, 2024 2023 2022 Current: Federal (1) $ 70 $ 5 $ 3 Foreign 98 94 53 State and local 4 2 — 172 101 56 Deferred: Federal 43 92 71 Foreign 17 16 5 State and local (4) 1 5 56 109 81 Total $ 228 $ 210 $ 137 (1) Federal includes U.S. taxes related to foreign income. A reconciliation of the U.S. federal statutory rate to Howmet’s effective tax rate was as follows (the effective tax rate for 2024, 2023, and 2022 was a provision on income): For the year ended December 31, 2024 2023 2022 U.S. federal statutory rate 21.0 % 21.0 % 21.0 % Foreign tax rate differential 0.7 (0.1) 0.1 U.S. and residual tax on foreign earnings (1) (0.6) 0.6 1.2 U.S. state and local taxes, net of federal income tax effect 1.0 0.7 0.5 Non-deductible officer compensation 0.7 0.7 1.2 Tax holidays (0.4) (0.4) (0.5) Tax credits (2) (5.1) (0.7) (0.9) Changes in valuation allowances (0.6) (1.1) 1.4 Changes in uncertain tax positions (3) — 2.1 — Excess benefit for stock compensation (0.7) (0.8) (0.8) Other 0.5 (0.5) (0.6) Effective tax rate 16.5 % 21.5 % 22.6 % (1) It is Howmet’s policy to treat taxes due from future inclusions in U.S. taxable income related to GILTI as a current period expense when incurred. (2) In 2024, the Company completed an R&D study, and as a result recorded a discrete tax benefit for $42 of prior year federal R&D credits approved under audit by the U.S. Internal Revenue Service and $8 of prior year state R&D credits. The Company also recorded a tax benefit for federal and state R&D credits earned during the current year of $13 and $3, respectively. (3) In 2023, the Company recorded an income tax reserve of $21 related to an uncertain French tax position. The components of net deferred tax assets and liabilities were as follows: 2024 2023 December 31, Deferred Deferred Deferred Deferred Depreciation $ 8 $ 529 $ 8 $ 510 R&D capitalization 73 — 24 — Employee benefits 232 9 240 4 Loss provisions 11 2 28 1 Deferred income/expense 46 293 32 1,210 Interest 6 — 32 — Tax loss carryforwards 1,941 — 2,905 — Tax credit carryforwards 110 — 216 — Other 5 8 10 4 $ 2,432 $ 841 $ 3,495 $ 1,729 Valuation allowance (1,705) — (1,821) — Total $ 727 $ 841 $ 1,674 $ 1,729 The following table details the expiration periods of the deferred tax assets presented above: December 31, 2024 Expires Expires No Expiration (1) Other (2) Total Tax loss carryforwards $ 427 $ 393 $ 1,121 $ — $ 1,941 Tax credit carryforwards 94 7 9 — 110 Other (3) — — 345 36 381 Valuation allowance (481) (324) (897) (3) (1,705) Total $ 40 $ 76 $ 578 $ 33 $ 727 (1) Deferred tax assets with no expiration may still have annual limitations on utilization. (2) Other represents deferred tax assets whose expiration is dependent upon the reversal of the underlying temporary difference. (3) A substantial amount of Other deferred tax assets relates to employee benefits that will become deductible for tax purposes in jurisdictions with unlimited expiration over an extended period of time as contributions are made to employee benefit plans and payments are made to retirees. The total deferred tax asset (net of valuation allowance) is supported by projections of future taxable income exclusive of reversing temporary differences (5%), and taxable temporary differences that reverse within the carryforward period (95%). Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not (greater than 50%) that a tax benefit will not be realized. In evaluating the need for a valuation allowance, management considers all potential sources of taxable income, including income available in carryback periods, future reversals of taxable temporary differences, projections of taxable income, and income from tax planning strategies, as well as all available positive and negative evidence. Positive evidence includes factors such as a history of profitable operations, projections of future profitability within the carryforward period, including from tax planning strategies, and Howmet’s experience with similar operations. Existing favorable contracts and the ability to sell products into established markets are additional positive evidence. Negative evidence includes items such as cumulative losses, projections of future losses, or carryforward periods that are not long enough to allow for the utilization of a deferred tax asset based on existing projections of income. Deferred tax assets for which no valuation allowance is recorded may not be realized upon changes in facts and circumstances, resulting in a future charge to establish a valuation allowance. Existing valuation allowances are re-examined under the same standards of positive and negative evidence. If it is determined that it is more likely than not that a deferred tax asset will be realized, the appropriate amount of the valuation allowance, if any, is released. Deferred tax assets and liabilities are also remeasured to reflect changes in underlying tax rates due to law changes and the granting and lapse of tax holidays. It is Howmet’s policy to apply a tax law ordering approach when considering the need for a valuation allowance on net operating losses expected to offset GILTI income inclusions. Under this approach, reductions in cash tax savings are not considered as part of the valuation allowance assessment. Instead, future GILTI inclusions are considered a source of taxable income that support the realizability of deferred tax assets. Howmet’s foreign tax credits in the U.S. have a 10-year carryforward period with expirations ranging from 2025 to 2027 (as of December 31, 2024). Valuation allowances were initially established in prior years on a portion of the foreign tax credit carryforwards, primarily due to insufficient foreign source income to allow for full utilization of the credits within the expiration period. Foreign tax credits of $46 and $20 expired at the end of 2024 and 2023, respectively, resulting in a corresponding decrease to the valuation allowance. Due to an increase in foreign source income, the Company decreased the valuation allowance accordingly by an additional $4 and $14 in 2024 and 2023, respectively. As of December 31, 2024, the cumulative amount of the valuation allowance was $41. The need for this valuation allowance will be reassessed on a continuous basis in future periods and, as a result, the allowance may increase or decrease based on changes in facts and circumstances. The Company recorded a net $7 decrease, $2 decrease, and $1 decrease to U.S. state valuation allowances in 2024, 2023, and 2022, respectively. After weighing all available positive and negative evidence, the Company determined the adjustments based on the underlying net deferred tax assets that were more likely than not realizable based on projected taxable income. Changes in fully reserved U.S. state tax losses, credits and other deferred tax assets resulting from expirations, audit adjustments, tax rate, and tax law changes also resulted in a corresponding net $30 decrease, $49 decrease, and $142 decrease in the valuation allowance in 2024, 2023, and 2022, respectively. Valuation allowances of $401 remain against state deferred tax assets expected to expire before utilization. The need for valuation allowances against state deferred tax assets will be reassessed on a continuous basis in future periods and, as a result, the allowance may increase or decrease based on changes in facts and circumstances. In 2022, after weighing all available evidence, the Company released a $6 valuation allowance in the U.K. related to interest deduction carryforwards. The need for valuation allowances will be reassessed by entity and by jurisdiction on a continuous basis in future periods and, as a result, the allowances may increase or decrease based on changes in facts and circumstances. The following table details the changes in the valuation allowance: December 31, 2024 2023 2022 Balance at beginning of year $ 1,821 $ 1,965 $ 2,279 Increase to allowance 20 21 40 Release of allowance (127) (198) (154) Acquisitions, divestitures and liquidations 75 (16) — Tax apportionment, tax rate and tax law changes (2) (11) (110) Foreign currency translation (82) 60 (90) Balance at end of year $ 1,705 $ 1,821 $ 1,965 Foreign U.S. GAAP earnings that have not otherwise been subject to U.S. tax, will generally be exempt from future U.S. tax under the 2017 Act when distributed. Such distributions, as well as distributions of previously taxed foreign earnings, could potentially be subject to U.S. state tax in certain states, and foreign withholding taxes. Foreign currency gains/losses related to the translation of previously taxed earnings from functional currency to U.S. dollars could also be subject to U.S. tax when distributed. Howmet would expect the potential withholding tax, U.S. state tax, and U.S. capital gains tax impacts to be immaterial and the potential deferred tax liability associated with future currency gains to be impracticable to determine. Howmet and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various states and foreign jurisdictions. With a few minor exceptions, Howmet is no longer subject to income tax examinations by tax authorities for years prior to 2014. All U.S. tax years prior to 2024 have been audited by the Internal Revenue Service. Various state and foreign jurisdiction tax authorities are in the process of examining the Company’s income tax returns for various tax years through 2023. The Company had net cash income tax payments of $177, $104, and $50 in 2024, 2023, and 2022, respectively. A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding interest and penalties) was as follows: December 31, 2024 2023 2022 Balance at beginning of year $ 16 $ 2 $ 2 Additions for tax positions of the current year — 1 — Additions for tax positions of prior years — 13 — Settlements with tax authorities (14) — — Foreign currency translation (1) — — Balance at end of year $ 1 $ 16 $ 2 For all periods presented, a portion of the balance pertains to state tax liabilities, which are presented before any offset for federal tax benefits. The effect of unrecognized tax benefits, if recorded, that would impact the annual effective tax rate for 2024, 2023, and 2022 would be less than 1%, 2%, and less than 1%, respectively, of pre-tax book income. Howmet does not anticipate that changes in its unrecognized tax benefits will have a material impact on the Statement of Consolidated Operations during 2025. It is Howmet’s policy to recognize interest and penalties related to income taxes as a component of the Provision for income taxes in the Statement of Consolidated Operations. Howmet recognized interest and penalties of $1, $7, and less than $1 in 2024, 2023, and 2022, respectively. Due to the expiration of the statute of limitations, settlements with tax authorities, reductions in prior accruals, and refunded overpayments, Howmet recognized interest income of $0, $2, and less than $1 in 2024, 2023, and 2022, respectively. As of December 31, 2024, 2023, and 2022, the amount accrued for the payment of interest and penalties was $9, $11, and less than $1, respectively.

Preferred and Common Stock

Preferred and Common Stock	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Preferred and Common Stock	Preferred and Common Stock Preferred Stock. Howmet has two classes of preferred stock: $3.75 Cumulative Preferred Stock (“Class A Preferred Stock”) and Class B Serial Preferred Stock. Class A Preferred Stock has 660,000 shares authorized at a par value of $100 per share with an annual $3.75 cumulative dividend preference per share. There were 546,024 shares of Class A Preferred Stock outstanding as of both December 31, 2024 and 2023. Class B Serial Preferred Stock has 10,000,000 shares authorized at a par value of $1 per share. There were no shares of Class B Serial Preferred Stock outstanding as of both December 31, 2024 and 2023. Common Stock. As of December 31, 2024, there were 600,000,000 shares authorized at a par value of $1 per share, and 405,431,361 shares issued and outstanding. Dividends paid were $0.26 per share in 2024 ($0.05 per share in each of the first and second quarters of 2024 and $0.08 per share in each of the third and fourth quarter of 2024), $0.17 per share in 2023 ($0.04 per share in each of the first, second, and third quarters of 2023 and $0.05 per share in the fourth quarter of 2023), and $0.10 per share in 2022 ($0.02 per share in each of the first, second, and third quarters of 2022 and $0.04 per share in the fourth quarter of 2022). As of December 31, 2024, 47 million shares of common stock were reserved for issuance under Howmet’s stock-based compensation plans. As of December 31, 2024, 24 million shares remain available for issuance. Howmet issues new shares to satisfy the exercise of stock options and the conversion of stock awards. Common Stock Outstanding and Share Activity (number of shares) Balance at December 31, 2021 421,691,912 Issued for stock-based compensation plans 1,819,651 Repurchase and retirement of common stock (11,356,506) Balance at December 31, 2022 412,155,057 Issued for stock-based compensation plans 2,993,340 Repurchase and retirement of common stock (5,233,936) Balance at December 31, 2023 409,914,461 Issued for stock-based compensation plans 1,287,412 Repurchase and retirement of common stock (5,770,512) Balance at December 31, 2024 405,431,361 The following table provides details for share repurchases during 2024, 2023, and 2022: Number of shares Average price per share (1) Total Q1 2024 open market repurchase 2,243,259 $66.87 $150 Q2 2024 open market repurchase 734,737 $81.66 $60 Q3 2024 open market repurchase 1,061,323 $94.22 $100 Q4 2024 open market repurchase 1,731,193 $109.75 $190 2024 Share repurchase total 5,770,512 $86.65 $500 Q1 2023 open market repurchase 576,629 $43.36 $25 Q2 2023 open market repurchase 2,246,294 $44.52 $100 Q3 2023 open market repurchase 506,800 $49.32 $25 Q4 2023 open market repurchase 1,904,213 $52.52 $100 2023 Share repurchase total 5,233,936 $47.76 $250 Q1 2022 open market repurchase 5,147,307 $34.00 $175 Q2 2022 open market repurchase 1,770,271 $33.89 $60 Q3 2022 open market repurchase 2,764,846 $36.17 $100 Q4 2022 open market repurchase 1,674,082 $38.83 $65 2022 Share repurchase total 11,356,506 $35.22 $400 (1) Excludes commissions cost. The total value of shares repurchased during 2024, 2023, and 2022 were $500, $250, and $400, respectively. All of the shares repurchased during 2024, 2023, and 2022 were immediately retired. The Company has a share repurchase program (the “Share Repurchase Program”) that, after giving effect to the additional $50 share repurchases made in January 2025 at an average price per share of $116.39, retiring approximately 0.4 million shares, has approximately $2,147 in Board authorization remaining available as of January 31, 2025. The current Share Repurchase Program was authorized by the Company’s Board of Directors on August 18, 2021 at $1,500, which was increased by the Board by $2,000 on July 30, 2024. Under the Company’s Share Repurchase Program, the Company may repurchase shares by means of trading plans established from time to time in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, block trades, private transactions, open market repurchases and/or accelerated share repurchase agreements, or other derivative transactions. There is no stated expiration for the Share Repurchase Program. Under its Share Repurchase Program, the Company may repurchase shares from time to time, in amounts, at prices, and at such times as the Company deems appropriate, subject to market conditions, legal requirements and other considerations. The Company is not obligated to repurchase any specific number of shares or to do so at any particular time, and the Share Repurchase Program may be suspended, modified, or terminated at any time without prior notice. The Inflation Reduction Act of 2022 imposes a 1% excise tax on net stock repurchases after December 31, 2022. The Company recorded $4 and $1 to additional capital for excise tax on net repurchases in 2024 and 2023, respectively. Stock-Based Compensation Howmet has a stock-based compensation plan under which stock options and/or restricted stock unit awards are granted, generally, in the first half of each year to eligible employees. Stock options are granted at the closing market price of Howmet’s common stock on the date of grant and typically vest over a three-year service period (1/3 each year) with a ten-year contractual term. Restricted stock unit awards typically vest over a three-year service period from the date of grant. As part of Howmet’s stock-based compensation plan design, individuals who are retirement-eligible have a six-month requisite service period in the year of grant. Certain of the restricted stock unit awards include performance and market conditions and are granted to certain eligible employees. For annual performance stock awards, the final number of shares earned will be based on Howmet’s achievement of profitability targets over the respective performance periods and will be earned at the end of the third year. Additionally, the annual performance stock awards include a total shareholder return (“TSR”) component, which depends upon relative performance against the TSRs of a group of peer companies. In 2024, 2023, and 2022, Howmet recognized stock-based compensation expense of $63 ($57 after-tax), $50 ($44 after-tax), and $54 ($49 after-tax), respectively. Senior executive performance awards granted in April 2020 were modified in June 2020, resulting in incremental compensation expense of $12, which was amortized over the remaining service period that ended April 1, 2023. All stock-based compensation expense recorded in 2024, 2023, and 2022 relates to restricted stock unit awards. No stock-based compensation expense was capitalized in any of those years. As of December 31, 2024, there was $28 (pre-tax) of unrecognized compensation expense related to non-vested restricted stock unit award grants. This expense is expected to be recognized over a weighted average period of 1.6 years. Stock-based compensation expense is based on the grant date fair value of the applicable equity grant. For restricted stock unit awards, the fair value is equivalent to the closing market price of Howmet’s common stock on the date of grant. The weighted average grant date fair value per share of the 2024, 2023, and 2022 performance stock awards with a market condition including a TSR component is $72.65, $47.59, and $44.44, respectively. The 2024, 2023, and 2022 performance awards were valued using a Monte Carlo model. A Monte Carlo simulation uses assumptions of stock price behavior to estimate the probability of satisfying market conditions and the resulting fair value of the award. The risk-free interest rate (4.4% in 2024, 4.4% in 2023, and 2.0% in 2022) was based on a yield curve of interest rates at the time of the grant based on the remaining performance period. In 2024, 2023, and 2022, volatility of 27.7%, 39.0%, and 39.4%, respectively, was estimated using Howmet's historical volatility. Stock options were last granted in 2018. The activity for stock options and stock awards during 2024 was as follows (options and awards in millions in the table below): Stock options Stock awards Number of Weighted Number of Weighted Outstanding, December 31, 2023 0.5 $ 22.67 3.0 $ 34.23 Granted — — 0.7 71.65 Exercised (0.4) 23.41 — — Converted — — (1.6) 32.11 Expired or forfeited — — (0.1) 43.89 Performance share adjustment — — 0.1 35.97 Outstanding, December 31, 2024 0.1 $ 20.98 2.1 $ 48.28 As of December 31, 2024, the stock options outstanding had a weighted average remaining contractual life of 2.1 and a total intrinsic value of $13. All of the stock options outstanding were fully vested and exercisable. In 2024, 2023, and 2022, the cash received from stock option exercises was $8, $11, and $16, respectively, and the total tax benefit realized from these exercises was $3, $2, and $2, respectively. The total intrinsic value of stock options exercised during 2024, 2023, and 2022 was $16, $9, and $10, respectively. The total intrinsic value of stock awards converted during 2024, 2023, and 2022 was $117, $187, and $61, respectively.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share (“EPS”) amounts are computed by dividing earnings, after the deduction of preferred stock dividends declared, by the average number of common shares outstanding. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive share equivalents outstanding. The information used to compute basic and diluted EPS attributable to Howmet common shareholders was as follows (shares in millions in the table below): For the year ended December 31, 2024 2023 2022 Net income attributable to common shareholders $ 1,155 $ 765 $ 469 Less: preferred stock dividends declared 2 2 2 Net income available to Howmet Aerospace common shareholders - basic and diluted $ 1,153 $ 763 $ 467 Average shares outstanding - basic 408 412 416 Effect of dilutive securities: Stock and performance awards 2 4 5 Average shares outstanding - diluted 410 416 421 Common stock outstanding as of December 31, 2024, 2023, and 2022 was approximately 405 million, 410 million, and 412 million, respectively. As average shares outstanding are used in the calculation for both basic and diluted EPS, the full impact of share repurchases and issuances was not fully realized in EPS in the period of repurchase or issuance since share activity may occur at varying points during a period. There were no shares relating to outstanding stock options excluded from the calculation of average shares outstanding - diluted during 2024, 2023, and 2022.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The following table details the activity of the three components that comprise Accumulated other comprehensive loss: 2024 2023 2022 Pension and other postretirement benefits ( G ) Balance at beginning of period $ (689) $ (653) $ (799) Other comprehensive (loss) income: Unrecognized net actuarial gain (loss) and prior service cost/benefit 3 (68) 87 Tax (expense) benefit (1) 15 (18) Total Other comprehensive income (loss) before reclassifications, net of tax 2 (53) 69 Amortization of net actuarial loss and prior service cost (1) 19 21 99 Tax expense (2) (4) (4) (22) Total amount reclassified from Accumulated other comprehensive loss, net of tax (3) 15 17 77 Total Other comprehensive income (loss) 17 (36) 146 Balance at end of period $ (672) $ (689) $ (653) Foreign currency translation Balance at beginning of period $ (1,136) $ (1,193) $ (1,062) Other comprehensive (loss) income (4) (71) 57 (131) Balance at end of period $ (1,207) $ (1,136) $ (1,193) Cash flow hedges Balance at beginning of period $ (5) $ 5 $ (2) Other comprehensive (loss) income: Net change from periodic revaluations — (19) (8) Tax benefit (expense) — 4 2 Total Other comprehensive (loss) income before reclassifications, net of tax — (15) (6) Net amount reclassified to earnings (5) 8 6 17 Tax (expense) benefit (2) (2) (1) (4) Total amount reclassified from Accumulated other comprehensive income (loss), net of tax (3) 6 5 13 Total Other comprehensive income (loss) 6 (10) 7 Balance at end of period $ 1 $ (5) $ 5 Accumulated other comprehensive loss balance at end of period $ (1,878) $ (1,830) $ (1,841) (1) These amounts were recorded in Restructuring and other charges (See Note D ) and Other expense, net (See Note F ) in the Statement of Consolidated Operations. (2) These amounts were included in Provision for income taxes (See Note H ) in the Statement of Consolidated Operations. (3) A positive amount indicates a corresponding charge to earnings and a negative amount indicates a corresponding benefit to earnings. (4) In all periods presented, no amounts were reclassified to earnings. (5) These amounts were recorded in Cost of goods sold in the Statement of Consolidated Operations.

Receivables

Receivables	12 Months Ended
	Dec. 31, 2024
Transfers and Servicing [Abstract]
Receivables	Receivables Sale of Receivables Programs The Company maintains an accounts receivables securitization arrangement through a wholly-owned special purpose entity (“SPE”). The net cash funding from the sale of accounts receivable was neither a use of cash nor a source of cash during 2024 or 2023. The accounts receivables securitization arrangement is one in which the Company, through an SPE, has a receivables purchase agreement (the “Receivables Purchase Agreement”) pursuant to which the SPE may sell certain receivables to financial institutions until the earlier of January 2, 2026 or a termination event. The Receivables Purchase Agreement contains customary representations and warranties, as well as affirmative and negative covenants. Pursuant to the Receivables Purchase Agreement, the Company does not maintain effective control over the transferred receivables, and therefore accounts for these transfers as sales of receivables. The Receivables Purchase Agreement also contains a provision that allows the Company to increase the facility limit to $325. The facility limit under the Receivables Purchase Agreement was $250 as of both December 31, 2024 and December 31, 2023, of which $250 was drawn at both December 31, 2024 and December 31, 2023. As collateral against the sold receivables, the SPE maintains a certain level of unsold receivables, which were $201 and $197 as of December 31, 2024 and December 31, 2023, respectively. The Company sold $1,625 and $1,547 of its receivables without recourse and received cash funding under this program during 2024 and 2023, respectively, resulting in derecognition of the receivables from the Company’s Consolidated Balance Sheet. Costs associated with the sales of receivables are reflected in the Company’s Statement of Consolidated Operations in Other expense, net for the periods in which the sales occur. Cash receipts from sold receivables under the Receivables Purchase Agreement are presented within operating activities in the Statement of Consolidated Cash Flows. Other Customer Receivable Sales In 2024 and 2023, the Company sold $712 and $593, respectively, of certain customers’ receivables in exchange for cash (of which $190 and $158 was outstanding from customers as of December 31, 2024 and December 31, 2023, respectively), the proceeds from which are presented in changes in receivables within operating activities in the Statement of Consolidated Cash Flows. Costs associated with the sales of receivables are reflected in the Company’s Statement of Consolidated Operations in Other expense, net for the periods in which the sales occur.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2024
Inventory Disclosure [Abstract]
Inventories	Inventories December 31, 2024 2023 Finished goods $ 458 $ 451 Work-in-process 903 891 Purchased raw materials 408 355 Operating supplies 71 68 Total inventories $ 1,840 $ 1,765

Properties, Plants, and Equipme

Properties, Plants, and Equipment, Net	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Properties, Plants, and Equipment, Net	Properties, Plants, and Equipment, Net December 31, 2024 December 31, 2023 Land and land rights $ 84 $ 88 Structures 1,025 1,018 Machinery and equipment 4,118 4,079 5,227 5,185 Less: accumulated depreciation and amortization 3,150 3,081 2,077 2,104 Construction work-in-progress 309 224 Properties, plants, and equipment, net $ 2,386 $ 2,328 Depreciation expense related to Properties, plants, and equipment recorded in Provision for depreciation and amortization in the Statement of Consolidated Operations was $243, $236, and $227 for the years ended December 31, 2024, 2023, and 2022, respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The following table details the changes in the carrying amount of goodwill: Engine Products Fastening Systems Engineered Structures Forged Wheels Total Balances at December 31, 2022 Goodwill $ 2,830 $ 1,595 $ 306 $ 7 $ 4,738 Accumulated impairment losses (719) (4) (2) — (725) Goodwill, net 2,111 1,591 304 7 4,013 Translation and other 13 9 — — 22 Balances at December 31, 2023 Goodwill 2,843 1,604 306 7 4,760 Accumulated impairment losses (719) (4) (2) — (725) Goodwill, net 2,124 1,600 304 7 4,035 Translation and other (17) (7) (1) — (25) Balances at December 31, 2024 Goodwill 2,826 1,597 305 7 4,735 Accumulated impairment losses (719) (4) (2) — (725) Goodwill, net $ 2,107 $ 1,593 $ 303 $ 7 $ 4,010 During the 2024 annual review of goodwill in the fourth quarter, management performed quantitative assessments on the Engine Products and Engineered Structures reporting units and qualitative assessments on the Fastening Systems and Forged Wheels reporting units. The estimated fair values of the reporting units exceeded their respective carrying values in excess of 60%; thus, there were no goodwill impairments. Howmet uses a DCF model to estimate the current fair value of the reporting unit, which is compared to its carrying value, when testing for impairment. Management believes forecasted cash flows are the best indicator of such fair value. A number of significant assumptions and estimates are involved in the application of the DCF model to forecast operating cash flows, including sales growth, production costs, and discount rate. Assumptions can vary among the reporting units. Cash flow forecasts are generally based on approved business unit operating plans for the early years and historical relationships in later years. The WACC rate for the individual reporting units is estimated with the assistance of valuation experts. The annual goodwill impairment tests in the fourth quarters of 2024, 2023, and 2022 indicated that goodwill was not impaired for any of the Company’s reporting units. If actual results or external market factors decline significantly from management’s estimates, future goodwill impairment charges (or the amount by which the carrying amount exceeds the reporting unit’s fair value without exceeding the total amount of goodwill allocated to that reporting unit) may be necessary and could be material. Other intangible assets were as follows: December 31, 2024 Gross carrying amount Accumulated Intangibles, net Computer software $ 217 $ (185) $ 32 Patents and licenses 66 (66) — Other intangibles 689 (268) 421 Total amortizable intangible assets 972 (519) 453 Indefinite-lived trade names and trademarks 22 — 22 Total intangible assets, net $ 994 $ (519) $ 475 December 31, 2023 Gross carrying amount Accumulated Intangibles, net Computer software $ 217 $ (182) $ 35 Patents and licenses 67 (66) 1 Other intangibles 683 (246) 437 Total amortizable intangible assets 967 (494) 473 Indefinite-lived trade names and trademarks 32 — 32 Total intangible assets, net $ 999 $ (494) $ 505 Computer software consists primarily of software costs associated with enterprise business solutions across Howmet's businesses. Amortization expense related to the intangible assets recorded in Provision for depreciation and amortization in the Statement of Consolidated Operations was $33, $35, and $36 for the years ended December 31, 2024, 2023, and 2022, respectively, and is expected to be in the range of approximately $30 to $36 annually from 2025 to 2029.

Leases

Leases	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Leases	Leases Operating lease cost includes short-term leases and variable lease payments and approximates cash paid. Operating lease cost was $67, $63, and $61 in 2024, 2023, and 2022, respectively. Operating lease cost in 2024, 2023, and the second half of 2022 includes the lease for the portion of the property in Pittsburgh, PA used as the corporate headquarters. Operating lease right-of-use assets and lease liabilities in the Consolidated Balance Sheet were as follows: December 31, 2024 2023 Right-of-use assets classified in Other noncurrent assets $ 155 $ 128 Current portion of lease liabilities classified in Other current liabilities $ 37 $ 32 Long-term portion of lease liabilities classified in Other noncurrent liabilities and deferred credits 119 97 Total lease liabilities $ 156 $ 129 Future minimum contractual operating lease obligations were as follows at December 31, 2024: 2025 $ 46 2026 39 2027 29 2028 21 2029 15 Thereafter 39 Total lease payments $ 189 Less: Imputed interest (33) Present value of lease liabilities $ 156 December 31, 2024 2023 2022 Right-of-use assets obtained in exchange for operating lease obligations $ 66 $ 68 $ 34 Weighted-average remaining lease term in years 5.9 6.4 5.6 Weighted-average discount rate 5.7 % 5.9 % 5.4 %

Debt

Debt	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Debt	Debt Debt. December 31, 2024 2023 5.125% Notes, due 2024 $ — $ 205 6.875% Notes, due 2025 — 600 USD Term Loan Agreement, due 2026 140 200 JPY Term Loan Agreement, due 2026 188 211 5.900% Notes, due 2027 625 625 6.750% Bonds, due 2028 300 300 3.000% Notes, due 2029 700 700 4.850% Notes, due 2031 (1) 500 — 5.950% Notes, due 2037 625 625 4.750% Iowa Finance Authority Loan, due 2042 250 250 Other, net (2) (13) (10) 3,315 3,706 Less: amount due within one year 6 206 Total long-term debt $ 3,309 $ 3,500 (1) The Company entered into a cross-currency swap to synthetically convert the 2031 Notes into a Euro liability of approximately €458 million with a fixed annual interest rate of 3.720%. (2) Other, net includes unamortized debt discounts and unamortized debt issuance costs related to outstanding notes and bonds listed in the table above and various financing arrangements related to subsidiaries. The principal amount of long-term debt maturing in each of the next five years is $5 in 2025, $323 in 2026, $625 in 2027, $300 in 2028, and $700 in 2029. Public Debt. On August 23, 2024, the Company completed the early redemption of all of the remaining outstanding principal amount of approximately $577 of the 6.875% Notes due May 2025 (the “2025 Notes”) in accordance with the terms of the notes. The Company completed the redemption with the net proceeds from the offering of the 4.850% Notes due October 2031 (the “2031 Notes”) and cash on hand at an aggregate redemption price of approximately $594, including accrued interest and an early termination premium of approximately $12 and $5, respectively, which were recorded in Interest expense, net, and Loss on debt redemption, respectively, in the Statement of Consolidated Operations. On August 22, 2024, the Company completed an offering of $500 aggregate principal amount of its 2031 Notes. The Company entered into a cross-currency swap to synthetically convert the 2031 Notes into a Euro liability of approximately €458 million. The fixed interest rate on the Euro liability is approximately 3.720% per annum. On July 1, 2024, the Company completed the early redemption of all of the remaining outstanding principal amount of $205 of the 5.125% Notes due October 2024 (the “ 2024 Notes”) . The Company redeemed the 2024 Notes at par value plus accrued interest. The 2024 Notes were redeemed with cash on hand at an aggregate redemption price of approximately $208, including accrued interest of approximately $3. In the second quarter of 2024, the Company repurchased approximately $23 aggregate principal amount of the 2025 Notes through an open market repurchase (“OMR”). The OMR was settled at slightly more than par value. On December 28, 2023, the Company completed an early partial redemption of its outstanding 2024 Notes in the aggregate principal amount of $500. Such 2024 Notes were redeemed at par with approximately $106 of cash on hand and approximately $400 from the Company’s term loan facilities at an aggregate redemption price of approximately $506, including accrued interest of approximately $6. On September 28, 2023, the Company completed an early partial redemption of its outstanding 2024 Notes in the aggregate principal amount of $200. Such 2024 Notes were redeemed at par with cash on hand at an aggregate redemption price of approximately $205, including accrued interest of approximately $5. On March 29, 2023, the Company completed the early partial redemption of an additional $150 aggregate principal amount of the 2024 Notes in accordance with the terms of the notes, and paid an aggregate of $155, including accrued interest and an early termination premium of approximately $4 and $1, respectively, which were recorded in Interest expense, net, and Loss on debt redemption, respectively, in the Statement of Consolidated Operations. In January 2023, the Company repurchased approximately $26 aggregate principal amount of its 2024 Notes through an OMR. The OMR was settled at slightly less than par value. In the second and fourth quarters of 2022, the Company repurchased in the open market approximately $69 aggregate principal amount of its 2024 Notes and paid approximately $71, including an early termination premium of approximately $2, which was recorded in Loss on debt redemption in the Statement of Consolidated Operations. The Company has the option to redeem certain of its notes and bonds in whole or part, at any time at a redemption price equal to the greater of principal amount or the sum of the present values of the remaining scheduled payments, discounted using a defined treasury rate plus a spread, plus in either case accrued and unpaid interest to the redemption date. Term Loan Facilities. On November 22, 2023, the Company entered into (i) a U.S. Dollar Term Loan Agreement, due 2026 (the “USD Term Loan Agreement”) and (ii) a Japanese Yen Term Loan Agreement, due 2026 (the “JPY Term Loan Agreement” and, together with the USD Term Loan Agreement, the “Term Loan Agreements” and each, individually, a “Term Loan Agreement”). Capitalized terms used in this “Term Loan Facilities” section but not otherwise defined shall have the meanings given to such terms in the applicable Term Loan Agreement. The USD Term Loan Agreement provided for a $200 senior unsecured delayed draw term loan facility (the “USD Term Loan Facility”), under which any borrowings mature on November 22, 2026, unless earlier terminated in accordance with the provisions of the USD Term Loan Agreement. Commencing in 2025, the USD Term Loan Facility requires quarterly principal payments through maturity based on a percentage of the original principal amount. The JPY Term Loan Agreement provided for a ¥33,000 million senior unsecured delayed draw term loan facility (the “JPY Term Loan Facility” and, together with the USD Term Loan Facility, the “Term Loan Facilities”), under which any borrowings mature on November 22, 2026, unless earlier terminated in accordance with the provisions of the JPY Term Loan Agreement. Each of the Term Loan Facilities is unsecured and amounts payable thereunder rank pari passu with all other unsecured, unsubordinated indebtedness of the Company. Borrowings under the USD Term Loan Facility are denominated in U.S. dollars, and borrowings under the JPY Term Loan Facility are denominated in Japanese yen. Loans under each of the Term Loan Facilities may be prepaid without premium or penalty. Under the USD Term Loan Facility, loans bear interest at a base rate or a rate equal to Term SOFR plus adjustment, plus, in each case, an applicable margin based on the credit ratings of the Company’s outstanding senior unsecured long-term debt. Based on the Company’s long-term debt ratings, the applicable margin on base rate loans was 0.375% and 0.500% per annum as of December 31, 2024 and December 31, 2023, respectively, and the applicable margin on Term SOFR loans was 1.375% and 1.500% per annum as of December 31, 2024 and December 31, 2023, respectively. Under the JPY Term Loan Facility, loans bear interest at a rate equal to the Cumulative Compounded RFR Rate utilizing the Tokyo Overnight Average Rate plus an applicable margin based on the credit ratings of the Company’s outstanding senior unsecured long-term debt. Based on the Company’s long-term debt ratings, the applicable margin on loans under the JPY Term Loan Facility is 1.500% and 1.625% per annum as of December 31, 2024 and December 31, 2023, respectively. The Company entered into interest rate swaps to exchange the floating interest rates of the Term Loan Facilities to fixed interest rates. The fixed interest rate on the USD Term Loan was 5.670% and 5.795% as of December 31, 2024 and December 31, 2023 , respectively. The fixed interest rate on the JPY Term Loan was 1.919% and 2.044% as of December 31, 2024 and December 31, 2023 , respectively. The obligations of the Company to pay amounts outstanding under the respective Term Loan Facilities may be accelerated upon the occurrence of an “Event of Default” as defined therein. Such Events of Default include, among others, (a) non-payment of obligations; (b) breach of any representation or warranty in any material respect; (c) non-performance of covenants and obligations; (d) with respect to other indebtedness in a principal amount in excess of $100, a default thereunder that causes such indebtedness to become due prior to its stated maturity or a default in the payment at maturity of any principal of such indebtedness; (e) the bankruptcy or insolvency of the Company; and (f) a change in control of the Company. The Term Loan Agreements contain respective covenants, including, among others, (a) limitations on the Company’s ability to incur liens securing indebtedness for borrowed money; (b) limitations on the Company’s ability to consummate a consolidation, merger, or sale of all or substantially all of its assets; (c) limitations on the Company’s ability to change the nature of its business; and (d) a limitation requiring the ratio of Consolidated Net Debt to Consolidated EBITDA as of the end of each fiscal quarter for the period of the four fiscal quarters most recently ended, to be less than or equal to 3.75 to 1.00. On December 27, 2023, the Company borrowed $200 under the USD Term Loan Facility. On December 20, 2024, the Company completed an early partial prepayment of its USD Term Loan in the aggregate principal amount of $60. This partial prepayment was made at par value plus accrued interest of less than $1. On December 1, 2023, the Company borrowed ¥29,702 million under the JPY Term Loan Facility. The amounts outstanding under the USD Term Loan Facility were $140 and $200 as of December 31, 2024 and December 31, 2023, respectively. The amounts outstanding under the JPY Term Loan Facility were ¥29,702 million ($188) and ¥29,702 million ($211) as of December 31, 2024 and December 31, 2023, respectively. Credit Facility. On July 27, 2023, the Company entered into the Second Amended and Restated Five-Year Revolving Credit Agreement (as so amended and restated, the “Credit Agreement”) by and among the Company, a syndicate of lenders and issuers named therein, Citibank, N.A., as administrative agent for the lenders and issuers, and JPMorgan Chase Bank, N.A., as syndication agent. The Credit Agreement amended and restated the Company’s Amended and Restated Five-Year Revolving Credit Agreement, dated as of September 28, 2021, as amended by Amendment No. 1 to Credit Agreement, dated as of February 13, 2023. The Credit Agreement provides a $1,000 senior unsecured revolving credit facility (the “Credit Facility”) that matures on July 27, 2028, unless extended or earlier terminated in accordance with the provisions of the Credit Agreement. The Company may make two one-year extension requests during the term of the Credit Facility, with any extension being subject to the lender consent requirements set forth in the Credit Agreement . Subject to the terms and conditions of the Credit Agreement, the Company may from time to time request increases in commitments under the Credit Facility, not to exceed $500 in aggregate principal amount, and may also request the issuance of letters of credit, subject to a letter of credit sublimit of $500 of the Credit Facility. Under the provisions of the Credit Agreement, based on Howmet’s current long-term debt ratings, Howmet pays an annual fee of 0.125% of the total commitment to maintain the Credit Facility. The Credit Facility is unsecured and amounts payable under it will rank pari passu with all other unsecured, unsubordinated indebtedness of the Company. Borrowings under the Credit Facility may be denominated in U.S. dollars or euros. Loans will bear interest at a base rate or, in the case of U.S. dollar-denominated loans, a rate equal to the Term Secured Overnight Financing Rate (“SOFR”) plus adjustment or, in the case of euro-denominated loans, the Euro inter-bank offered rate (“EURIBOR”), plus, in each case, an applicable margin based on the credit ratings of the Company’s outstanding senior unsecured long-term debt. Based on Howmet’s current long-term debt ratings, there would be no applicable margin on base rate loans and the applicable margin on Term SOFR loans and EURIBOR loans would be 1.000% per annum. The applicable margin is subject to change based on the Company’s long-term debt ratings. Loans may be prepaid without premium or penalty, subject to customary breakage costs. The obligation of the Company to pay amounts outstanding under the Credit Facility may be accelerated upon the occurrence of an “Event of Default” as defined in the Credit Agreement. Such Events of Default include, among others, (a) non-payment of obligations; (b) breach of any representation or warranty in any material respect; (c) non-performance of covenants and obligations; (d) with respect to other indebtedness in a principal amount in excess of $100, a default thereunder that causes such indebtedness to become due prior to its stated maturity or a default in the payment at maturity of any principal of such indebtedness; (e) the bankruptcy or insolvency of Howmet; and (f) a change in control of the Company. The Credit Agreement contains covenants, including, among others, (a) limitations on the Company’s ability to incur liens securing indebtedness for borrowed money; (b) limitations on the Company’s ability to consummate a consolidation, merger or sale of all or substantially all of its assets; (c) limitations on the Company’s ability to change the nature of its business; and (d) a limitation requiring the ratio of Consolidated Net Debt to Consolidated EBITDA (each as defined in the Credit Agreement) as of the end of each fiscal quarter for the period of the four fiscal quarters most recently ended, to be less than or equal to 3.75 to 1.00. There were no amounts outstanding under the Credit Agreement as of December 31, 2024 and 2023 , and no amounts were borrowed during 2024, 2023 or 2022 under the Credit Agreement. As of December 31, 2024, the Company was in compliance with all covenants under the Credit Agreement. Availability under the Credit Agreement could be reduced in future periods if the Company fails to maintain the required ratio referenced above. Commercial Pape r. On April 4, 2024, the Company established a commercial paper program under which the Company may issue unsecured commercial paper notes (“commercial paper”) from time to time up to a maximum aggregate face amount of $1,000 outstanding at any time. The maturities of the commercial paper may vary but will not exceed 397 days from the date of issue and will rank equal in right of payment with all other unsecured senior indebtedness of the Company. The proceeds of the commercial paper will be used for general corporate purposes. There were no amounts outstanding under the commercial paper program as of December 31, 2024 .

Other Financial Instruments

Other Financial Instruments	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Other Financial Instruments	Other Financial Instruments Fair Value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy distinguishes between (i) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (ii) an entity’s own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs). The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below: • Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. • Level 2 - Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3 - Inputs that are both significant to the fair value measurement and unobservable. The carrying values of Cash and cash equivalents, restricted cash, derivatives, noncurrent receivables, and Long-term debt due within one year included in the Consolidated Balance Sheet approximate their fair value. The aforementioned derivatives are included in Prepaid expenses and other current assets, Other noncurrent assets, Other current liabilities, and Other noncurrent liabilities and deferred credits in the Consolidated Balance Sheet, as applicable. The Company holds exchange-traded fixed income securities which are considered available-for-sale securities and are carried at fair value based on quoted market prices. The aforementioned securities are classified in Level 1 of the fair value hierarchy and are included in Other noncurrent assets in the Consolidated Balance Sheet. The fair value of Long-term debt, less amount due within one year was based on quoted market prices for public debt and on interest rates that are currently available to Howmet for issuance of debt with similar terms and maturities for non-public debt. The fair value amounts for all Long-term debt were classified in Level 2 of the fair value hierarchy. 2024 2023 December 31, Carrying Fair Carrying Fair Long-term debt, less amount due within one year $ 3,309 $ 3,298 $ 3,500 $ 3,504 Restricted cash was $1, less than $1, and $1 in 2024, 2023, and 2022 , respectively, and was recorded in Prepaid expenses and other current assets in the Consolidated Balance Sheet.

Cash Flow Information

Cash Flow Information	12 Months Ended
	Dec. 31, 2024
Supplemental Cash Flow Information [Abstract]
Cash Flow Information	Cash Flow Information Cash paid for interest and income taxes was as follows: 2024 2023 2022 Interest, net of amounts capitalized $ 180 $ 221 $ 224 Income taxes, net of amounts refunded $ 177 $ 104 $ 50 The Company incurred capital expenditures which remain unpaid at December 31, 2024, 2023, and 2022 of $97, $72, and $55, respectively, and will result in cash outflows within investing activities in the Statement of Consolidated Cash Flows in subsequent periods. In September 2022, the FASB issued guidance to enhance the transparency of disclosures regarding supplier finance programs. These changes became effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, except for the amendment on rollforward information, which is effective for fiscal years beginning after December 15, 2023. On January 1, 2023, the Company adopted the changes issued by the FASB related to disclosure requirements of supplier finance program obligations. We offer voluntary supplier finance programs to suppliers who may elect to sell their receivables to third parties at the sole discretion of both the supplier and the third parties. The program is at no cost to the Company and provides additional liquidity to our suppliers, if they desire, at their cost. Under these programs, the Company pays the third party bank, rather than the supplier, the stated amount of the confirmed invoices on the original maturity date of the invoices. The Company or the third party bank may terminate a program upon at least 30 days’ notice. Supplier invoices under the program require payment in full no more than approximately 120 days of the invoice date. As of December 31, 2024 and 2023, supplier invoices that are subject to future payment under these programs were $268 and $258, respectively, and are included in Accounts payable, trade in the Consolidated Balance Sheet. The rollforward of the Company’s outstanding obligations confirmed as valid under its supplier financing program Confirmed obligations outstanding at December 31, 2023 $ 258 Invoices confirmed during the year 877 Confirmed invoices paid during the year (867) Confirmed obligations outstanding at December 31, 2024 $ 268

Divestitures

Divestitures	12 Months Ended
	Dec. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Divestitures	Divestitures 2024 Divestiture

Contingencies and Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Contingencies and Commitments Contingencies Environmental Matters. Howmet participates in environmental assessments and/or cleanups at more than 30 locations. These include owned or operating facilities and adjoining properties, previously owned or operated facilities and adjoining properties, and waste sites, including Superfund (Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”)) sites. A liability is recorded for environmental remediation when a cleanup program becomes probable and the costs can be reasonably estimated. As assessments and cleanups proceed, the liability is adjusted based on progress made in determining the extent of remedial actions and related costs. The liability can change substantially due to factors such as the nature and extent of contamination, changes in remedial requirements, and technological changes, among others. The Company's remediation reserve balance was $19 and $17 as of December 31, 2024 and 2023 , respectively, and was recorded in Other noncurrent liabilities and deferred credits in the Consolidated Balance Sheet (of which $10 and $7, respectively, was classified as a current liability), and reflects the most probable costs to remediate identified environmental conditions for which costs can be reasonably estimated. Payments related to remediation expenses applied against the reserve were $2 and $3 in 2024 and 2023, respectively, and included expenditures currently mandated, as well as those not required by any regulatory authority or third party. Included in annual operating expenses are the recurring costs of managing hazardous substances and environmental programs. These costs are estimated to be less than 1% of Cost of goods sold. Tax. In December 2013 and 2014, the Company received audit assessment notices from the French Tax Authority (“FTA”) for the 2010 through 2012 tax years. In 2016, the Company appealed to the Committee of the Abuse of Tax Law, where it received a favorable nonbinding decision. The FTA disagreed with the Committee of the Abuse of Tax Law’s opinion, and the Company appealed to the Montreuil Administrative Court, where in 2020 the Company prevailed on the merits. The FTA appealed this decision to the Paris Administrative Court of Appeal in 2021. On March 31, 2023, the Company received an adverse decision from the Paris Administrative Court of Appeal. The Company appealed this decision to the French Administrative Supreme Court. The assessment amount was $17 (€16 million), including $10 (€9 million) of tax and interest up through 2017 and $7 (€7 million) of penalties. The Company estimates additional interest to be $2 (€2 million). On July 23, 2024, the Company received the French Administrative Supreme Court’s decision. That decision upheld the assessment of $10 (€9 million) of tax and interest, while cancelling the penalties of $7 (€7 million) and remanding the penalty assessment issue to the Paris Administrative Court of Appeal for reexamination. As a result, the Company has no further right to appeal the assessment of tax and interest but will continue to protest the penalties. In 2023, the Company recorded an income tax reserve in Provision for income taxes in the Statement of Consolidated Operations of $21 (€19 million), which includes tax, estimated interest and penalties, for the 2010 through 2012 tax years, as well as the remaining tax years open for reassessment (2020-2023). In accordance with FTA dispute resolution practices, the Company paid the assessment amount including tax, interest, and penalties, to the FTA in December 2023. The Company is expecting to pay the additional interest related to the assessment in 2025. The Company also paid the estimated tax related to the 2020-2023 tax years in 2023. As of the third quarter of 2024, the Company no longer recorded an uncertain tax position related to the tax and interest assessed. In October 2024, the Company received a refund of the penalties that were remanded. We will continue to record an income tax reserve for penalties determined more than likely to be upheld, until the uncertain tax position is settled. Indemnified Matters. The Separation and Distribution Agreement, dated October 31, 2016, that the Company entered into with Alcoa Corporation in connection with its separation from Alcoa Corporation, and the Separation and Distribution Agreement, dated March 31, 2020, that the Company entered into with Arconic Corporation in connection with its separation from Arconic Corporation, provide for cross-indemnities for claims subject to indemnification between the Company and Alcoa Corporation and between the Company and Arconic Corporation, respectively. To date, Alcoa Corporation and Arconic Corporation have fulfilled their respective indemnification obligations to the Company, and claims subject to indemnification by Alcoa Corporation or Arconic Corporation have not impacted the Company financially. Among other claims that are covered by these indemnities, Arconic Corporation indemnifies the Company (previously named Arconic Inc. and, prior to that, Alcoa Inc.) for all potential liabilities associated with the fire that occurred at the Grenfell Tower in London, U.K. on June 14, 2017 (“Grenfell Fire”), including the following: (i) Regulatory Investigations . Arconic Architectural Products SAS (“AAP SAS”) (now a subsidiary of Arconic Corporation) supplied Reynobond PE to its customer who used the product as one component of the overall cladding system on Grenfell Tower. Regulatory Investigations into the overall Grenfell Fire are being conducted, including a criminal investigation by the London Metropolitan Police Service and a Public Inquiry by the British government (regarding which AAP SAS is a participant) (together, the “U.K. Proceedings”). On September 4, 2024, the Public Inquiry published its Phase 2 report on the Grenfell fire. (ii) United Kingdom Litigation . On December 23, 2020, survivors and estates of decedents of the Grenfell Fire and emergency responders filed suit against 23 defendants, including the Company. The substantial majority of these suits were settled pursuant to the terms of a confidential settlement agreement and are now discontinued and closed. The claimants in the remaining suits are mediating their claims with the defendants. On June 21, 2024, the Company was joined as a party to proceedings initiated by the Royal Borough of Kensington and Chelsea (RBKC) and Chelsea Tenant Management Organisation Ltd. (KCTMO) that are currently pending against AAP SAS and Whirlpool. By February 14, 2025, RBKC and KCTMO must serve their Particulars of Claim and Schedule of Loss on defendants. (iii) Raul v. Albaugh, et al. (United States District Court for the District of Delaware) . On June 22, 2018, a derivative complaint was filed nominally on behalf of Arconic Inc. by a purported Arconic Inc. stockholder against the then members of Arconic Inc.’s Board of Directors, Klaus Kleinfeld and Ken Giacobbe, naming Arconic Inc. as a nominal defendant. The complaint alleged violations of the federal securities laws relating to the Grenfell Fire, as well as claims under Delaware state law for breaches of fiduciary duty, gross mismanagement and abuse of control, and also alleges that the defendants improperly authorized the sale of Reynobond PE for unsafe uses. On October 22, 2024, the parties executed a settlement term sheet that set forth the material terms and conditions associated with the resolution of this derivative action. On October 28, 2024, November 27, 2024 and January 27, 2025, the parties filed joint status reports regarding this development. On January 28, 2025, the court ordered that the parties file a joint status report or a stipulation of dismissal on or before March 28, 2025. The parties plan to enter into a formal, final Stipulation and Agreement of Settlement, Compromise, and Release in the near term, which will be presented to the court for approval. Legal Proceedings. Lehman Brothers International (Europe) Legal Proceeding . On June 26, 2020, Lehman Brothers International (Europe) (“LBIE”) filed proceedings in the High Court of Justice, Business and Property Courts of England and Wales against two subsidiaries of the Company, FR Acquisitions Corporation (Europe) Ltd and JFB Firth Rixson Inc. (collectively, the “Firth Rixson Entities”). The proceedings concerned two interest rate swap transactions that the Firth Rixson Entities entered into with LBIE in 2007 and 2008. As a result of the ruling issued by the Court in October 2022, the Company recorded $65 in Other current liabilities in the Consolidated Balance Sheet and took a pre-tax charge of this amount in Other expense, net in the Statement of Consolidated Operations in the third quarter of 2022. The Firth Rixson Entities appealed the Court’s ruling. On June 15, 2023, the Company, the Firth Rixson Entities, and LBIE reached a full and final settlement of all claims arising out of the LBIE legal proceedings. The settlement provided for payment of $40: $15 paid in July 2023 and $25 paid in July 2024. Lockheed Martin Corp. v. Howmet Aerospace Inc. On November 30, 2023, Lockheed Martin Corporation (“Lockheed Martin”) filed a complaint in federal district court in the Northern District of Texas against the Company and its subsidiary RTI Advanced Forming, Inc. (“RTI”) as defendants. The complaint alleged that the Company and RTI breached a Master Purchase Order between Lockheed Martin and RTI related to the F-35 Joint Strike Fighter production program between Lockheed Martin and the United States government (the “F-35 Program”) by seeking a fair market price adjustment for the provision of titanium mill products under RTI’s separate agreements with Lockheed Martin’s subcontractors for the F-35 Program. Following various claims and counterclaims and court-ordered mediation, the parties reached a confidential settlement agreement on April 2, 2024, to supply until December 31, 2026 subject to revised terms mutually agreed to by the parties. The settlement had no material impact on the results of operations in the current year. The parties stipulated to the dismissal of all claims and counterclaims with prejudice on April 2, 2024. Other. In addition to the matters discussed above, various other lawsuits, claims, and proceedings have been or may be instituted or asserted against the Company, including those pertaining to environmental, product liability, safety and health, employment, tax and antitrust matters. While the amounts claimed in these other matters may be substantial, the ultimate liability cannot currently be determined because of the considerable uncertainties that exist. Therefore, it is possible that the Company’s liquidity or results of operations in a period could be materially affected by one or more of these other matters. However, based on facts currently available, management believes that the disposition of these other matters that are pending or asserted will not have a material adverse effect, individually or in the aggregate, on the results of operations, financial position or cash flows of the Company. Commitments Purchase & Other Obligations. Howmet has entered into commitments for raw materials, energy and other obligations, which total $237 in 2025, $51 in 2026, $42 in 2027, $40 in 2028, $39 in 2029 and none thereafter. Operating Leases. See Note P for the operating lease future minimum contractual obligations. Guarantees. As of December 31, 2024, Howmet had outstanding bank guarantees related to tax matters, customs duties, rental, plant expansion, and environmental obligations. The total amount committed under these guarantees, which expire at various dates between 2025 and 2027, was $6 as of December 31, 2024. Pursuant to the Separation and Distribution Agreement, dated as of October 31, 2016, between Howmet and Alcoa Corporation, Howmet was required to provide certain guarantees for Alcoa Corporation, which were included in Other noncurrent liabilities and deferred credits in the Consolidated Balance Sheet. The remaining guarantee, which had a fair value of $6 as of both December 31, 2024 and 2023, relates to a long-term energy supply agreement that expires in 2047 at an Alcoa Corporation facility, for which the Company is secondarily liable in the event of a payment default by Alcoa Corporation. If the Company incurs any liability under this guarantee, Arconic Corporation is obligated to indemnify the Company for 50% of such liability. The Company currently views the risk of an Alcoa Corporation payment default on its obligations under the contract to be remote. The Company is required to provide a guarantee up to an estimated present value amount of approximately $1,121 and $1,131 as of December 31, 2024 and 2023, respectively, in the event of an Alcoa Corporation default. In the fourth quarter of 2024, 2023, and 2022, a surety bond with a limit of $80 relating to this guarantee was obtained by Alcoa Corporation to protect Howmet's obligation. This surety bond will be renewed on an annual basis by Alcoa Corporation. Letters of Credit. The Company has outstanding letters of credit, primarily related to workers’ compensation, environmental obligations, insurance obligations, and tax matters. The total amount committed under these letters of credit, which automatically renew or expire at various dates, primarily in 2025, was $90 as of December 31, 2024 . Pursuant to the Separation and Distribution Agreements between the Company and Arconic Corporation and between the Company and Alcoa Corporation, the Company is required to retain letters of credit of $48 (which are included in the $90 in the above paragraph) that had previously been provided related to the Company, Arconic Corporation, and Alcoa Corporation workers’ compensation claims that occurred prior to the respective separation transactions of April 1, 2020 and November 1, 2016. Arconic Corporation and Alcoa Corporation workers’ compensation and letters of credit fees paid by the Company are proportionally billed to, and are reimbursed by, Arconic Corporation and Alcoa Corporation, respectively. Also, the Company was required to provide letters of credit for certain Arconic Corporation and Alcoa Corporation environmental obligations and, as a result, the Company has $17 of outstanding letters of credit relating to such liabilities (which are also included in the $90 in the above paragraph). Arconic Corporation is being billed for these letter of credit fees paid by the Company and will reimburse the Company for any payments made under these letters of credit. Surety Bonds. The Company has outstanding surety bonds primarily related to customs duties, workers’ compensation, environmental-related matters, and contract performance. The total amount committed under these annual surety bonds, which automatically renew or expire at various dates, primarily in 2025 and 2026, was $44 as of December 31, 2024. Pursuant to the Separation and Distribution Agreements between the Company and Arconic Corporation and between the Company and Alcoa Corporation, the Company is required to provide surety bonds of $21, which are included in the $44 in the above paragraph, that had previously been provided related to the Company, Arconic Corporation, and Alcoa Corporation workers’ compensation claims that occurred prior to the respective separation transactions of April 1, 2020 and November 1, 2016. Arconic Corporation and Alcoa Corporation workers’ compensation claims and surety bond fees paid by the Company are proportionately billed to, and are reimbursed by, Arconic Corporation and Alcoa Corporation, respectively.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2024
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Management evaluated all activity of Howmet and concluded that no subsequent events have occurred that would require recognition in the Consolidated Financial Statements or disclosure in the Notes to the Consolidated Financial Statements, except as noted below: See Note I regarding share repurchases made in January 2025.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net income	$ 1,155	$ 765	$ 469

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Cybersecurity is a critical component of the Company’s overall enterprise risk management program. Howmet has implemented a framework of principles, policies, and technology designed to protect our systems and data from cybersecurity threats. The Company’s Board of Directors (the “Board”), through its Cybersecurity Committee, is actively engaged in overseeing and reviewing the Company’s cybersecurity programs and risk management. Although past cybersecurity incidents did not have a material impact on the Company, including our strategy, financial condition, or results of operations, the scope and impact of any future cybersecurity threat or incident cannot be predicted. See Part I, Item 1A. (Risk Factors) for more information on how material cybersecurity incidents may impact the Company. Howmet has implemented a multi-faceted cybersecurity risk management framework, which includes progressing toward alignment with cybersecurity standards published by the National Institute of Standards and Technology and achievement of the Department of Defense (DoD) Cybersecurity Maturity Model Certification, which will require companies like Howmet that do business with the DoD to obtain specific third-party certifications relating to specified cybersecurity standards to be eligible for new contract awards. We deploy and operate preventive and detective controls and processes to mitigate cybersecurity threats, including monitoring our network for known vulnerabilities and signs of unauthorized attempts to access our data and systems. Our approach includes conducting internal vulnerability assessments, external penetration testing, and attack simulation. In addition, the Company subscribes to third-party managed security service providers that continuously monitor the Company’s systems to assist with early cybersecurity threat detection and protection. Howmet conducts cybersecurity risk assessments of key vendors and other counterparties for any potential risks. Risk-based action plans are further developed to take into account evolving threats, which result in recommendations for new protocols and infrastructure. The Company has a robust program of employee education on the prevention of unauthorized access to Company information and systems. The Company's cybersecurity risk management is integrated in our overall risk management processes. Our enterprise risks, including cybersecurity risks, are reviewed on a biannual basis. The review involves participation and engagement by, among others, subject matter experts like the Company’s Chief Information Security Officer (“CISO”) and Chief Information Officer (“CIO”), representatives of the Company’s business segments, and executive management. Mitigation plans are deployed across the Company with cross-functional collaboration as applicable. Enterprise risk management is reviewed with the Board annually. In the event of a potential material cybersecurity incident or ransomware demand, Howmet has adopted a policy to respond to such event, which includes protocols and procedures to, among other things, escalate the incident or demand, form a core cross-functional response leadership team (including the CISO and CIO) to assess severity, formulate response and remediation, and determine any required reporting or notifications.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	The Company's cybersecurity risk management is integrated in our overall risk management processes. Our enterprise risks, including cybersecurity risks, are reviewed on a biannual basis. The review involves participation and engagement by, among others, subject matter experts like the Company’s Chief Information Security Officer (“CISO”) and Chief Information Officer (“CIO”), representatives of the Company’s business segments, and executive management. Mitigation plans are deployed across the Company with cross-functional collaboration as applicable. Enterprise risk management is reviewed with the Board annually.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	The Cybersecurity Committee, which originated in 2015 as a dedicated cybersecurity subcommittee of the Audit Committee, was made a formal committee of the Board in 2022. The Cybersecurity Committee assists the Board in its oversight of the Company’s cybersecurity programs and risks. Its responsibilities include reviewing the state of the Company’s cybersecurity, its strategy, policies, and procedures to mitigate cybersecurity risks, and any significant cybersecurity incidents. The Committee also considers the cybersecurity threat landscape and the impact of emerging cybersecurity developments and regulations that may affect Howmet.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Cybersecurity Committee, which originated in 2015 as a dedicated cybersecurity subcommittee of the Audit Committee, was made a formal committee of the Board in 2022. The Cybersecurity Committee assists the Board in its oversight of the Company’s cybersecurity programs and risks.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Cybersecurity Committee currently comprises three members and meets at least quarterly with members of management, including the CISO and CIO. The Cybersecurity Committee may, from time to time, invite third-party advisors and experts as it deems appropriate. Pursuant to guidelines adopted by the Cybersecurity Committee, management is required to report immediately to the Chair of the Cybersecurity Committee upon the occurrence of certain cybersecurity incidents and ransomware demands. The Cybersecurity Committee reports to the full Board after each of its meetings and as needed regarding the cybersecurity risks, incidents, and other matters reviewed and considered by the Committee.
Cybersecurity Risk Role of Management [Text Block]	The Company’s CISO leads management’s assessment, prevention, and management of cybersecurity risks. The CISO reports to the CIO who has responsibility for the usability, implementation, and management of our information and computing systems. Both bring to their roles extensive experience in information technology and cybersecurity: • The Company’s CISO joined the Company in 2022. The CISO has over 20 years of experience in information technology, cybersecurity and physical security management, including as Cybersecurity Operations Director at United States Steel Corporation (2020-2022); Director, Global Information Security and Compliance at Kennametal, Inc. (2018-2020); and Global Chief Information Security Officer/HIPAA Security Officer at Westlake Chemical (2013-2017). The CISO holds a Bachelor of Sciences degree in Information Systems Management from Carlow University and a Master of Sciences degree in Information Systems from Robert Morris University and is a Certified Systems Security Professional. • The Company’s CIO joined the Company in 2021. The CIO has over 20 years of experience in information technology, including, most recently, as Vice President Global IT and Chief Information Officer at Varroc Lighting Systems (2018-2021) and Chief Information Officer at AM General LLC (2016-2018). The CIO holds a Bachelor of Engineering degree in Industrial Engineering from Universidad de Lima.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The Company’s CISO leads management’s assessment, prevention, and management of cybersecurity risks. The CISO reports to the CIO who has responsibility for the usability, implementation, and management of our information and computing systems.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Both bring to their roles extensive experience in information technology and cybersecurity: • The Company’s CISO joined the Company in 2022. The CISO has over 20 years of experience in information technology, cybersecurity and physical security management, including as Cybersecurity Operations Director at United States Steel Corporation (2020-2022); Director, Global Information Security and Compliance at Kennametal, Inc. (2018-2020); and Global Chief Information Security Officer/HIPAA Security Officer at Westlake Chemical (2013-2017). The CISO holds a Bachelor of Sciences degree in Information Systems Management from Carlow University and a Master of Sciences degree in Information Systems from Robert Morris University and is a Certified Systems Security Professional. • The Company’s CIO joined the Company in 2021. The CIO has over 20 years of experience in information technology, including, most recently, as Vice President Global IT and Chief Information Officer at Varroc Lighting Systems (2018-2021) and Chief Information Officer at AM General LLC (2016-2018). The CIO holds a Bachelor of Engineering degree in Industrial Engineering from Universidad de Lima.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	The Cybersecurity Committee, which originated in 2015 as a dedicated cybersecurity subcommittee of the Audit Committee, was made a formal committee of the Board in 2022. The Cybersecurity Committee assists the Board in its oversight of the Company’s cybersecurity programs and risks. Its responsibilities include reviewing the state of the Company’s cybersecurity, its strategy, policies, and procedures to mitigate cybersecurity risks, and any significant cybersecurity incidents. The Committee also considers the cybersecurity threat landscape and the impact of emerging cybersecurity developments and regulations that may affect Howmet.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation. The Consolidated Financial Statements of Howmet Aerospace Inc. (formerly known as Arconic Inc.) and subsidiaries (“Howmet” or the “Company” or “we” or “our”) are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and require management to make certain judgments, estimates, and assumptions. These estimates are based on historical experience and, in some cases, assumptions based on current and future market expectations, including considerations relating to changes in the aerospace industry. The impact of these changes, including the macroeconomic considerations, remains highly uncertain. Management has made its best estimates using all relevant information available at the time, but it is possible that our estimates will differ from our actual results and affect the Consolidated Financial Statements in future periods and potentially require adverse adjustments to the recoverability of goodwill, intangible and long-lived assets, the realizability of deferred tax assets, and other judgments and estimations and assumptions. These may affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements. They also may affect the reported amounts of sales and expenses during the reporting period. Actual results could differ from those estimates upon subsequent resolution of identified matters. Certain amounts in previously issued financial statements were reclassified to conform to the current period presentation. The Company derived approximately 52% , 49%, and 46% of its revenue from products sold to the commercial aerospace market for the years ended December 31, 2024, 2023, and 2022, respectively. Aircraft production in the commercial aerospace industry continues to grow based on increases in demand for narrow body and wide body aircraft. We expect our commercial aerospace wide body and narrow body demand, including engine spares, also to continue to grow. Quality control issues at The Boeing Company (“Boeing”) have had and are expected to continue to have a negative impact on narrow body and wide body production rates in the near term. For instance, the Federal Aviation Administration stated that it will not approve production rate increases above 38 aircraft per month or additional production lines for the Boeing 737 MAX until it is satisfied that Boeing is in full compliance with required quality control procedures. In addition, a labor union work stoppage and ensuing production restart at Boeing has negatively impacted results. Boeing production levels have had and are expected to have a material impact on the financial performance of Howmet. The timing and level of future aircraft builds by original equipment manufacturers are subject to changes and uncertainties, which may cause our future results to differ from prior periods due to changes in product mix in certain segments.
Principles of Consolidation	Principles of Consolidation. The Consolidated Financial Statements include the accounts of Howmet Aerospace Inc. and companies in which Howmet Aerospace Inc. has a controlling interest. Intercompany transactions have been eliminated. Investments in affiliates in which Howmet Aerospace Inc. cannot exercise significant influence that do not have readily determinable fair values are accounted for at cost less impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. Management also evaluates whether a Howmet Aerospace Inc. entity or interest is a variable interest entity and whether Howmet Aerospace Inc. is the primary beneficiary. Consolidation is required if both of these criteria are met. Howmet Aerospace Inc. does not have any variable interest entities requiring consolidation.
Cash Equivalents	Cash Equivalents. Cash equivalents are highly liquid investments purchased with an original maturity of three months or less.
Inventory Valuation	Inventory Valuation. Inventories are carried at the lower of cost or net realizable value with the cost of inventories determined under a combination of the first-in, first-out (“FIFO”), last-in, first-out (“LIFO”) and average-cost methods. LIFO is used for inventory valuation for certain of the U.S. locations in the Engine Products, Engineered Structures, and Forged Wheels segments, See Note M for further details.
Properties, Plants, and Equipment	Properties, Plants, and Equipment. Properties, plants, and equipment are recorded at cost. Depreciation is recorded principally on the straight-line method at rates based on the estimated useful lives of the assets. The following table details the weighted-average useful lives of structures and machinery and equipment by reporting segment (numbers in years): Structures Machinery and equipment Engine Products 28 16 Fastening Systems 27 17 Engineered Structures 29 20 Forged Wheels 27 18 Gains or losses from the sale of asset groups or properties are generally recorded in Restructuring and other charges while the sale of individual assets are recorded in Other expense, net (see policy below for assets classified as discontinued operations and held for sale). Repairs and maintenance are charged to expense as incurred. Interest related to the construction of qualifying assets is capitalized as part of the construction costs. Properties, plants, and equipment are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets (asset group) may not be recoverable. Recoverability of assets is determined by comparing the estimated undiscounted net cash flows of the operations related to the assets (asset group) to their carrying amount. An impairment loss would be recognized when the carrying amount of the assets (asset group) exceeds the estimated undiscounted net cash flows. The amount of the impairment loss to be recorded is measured as the excess of the carrying value of the assets (asset group) over their fair value, with fair value determined using the best information available, which generally is a discounted cash flow (“DCF”) model. The determination of what constitutes an asset group, the associated estimated undiscounted net cash flows, and the estimated useful lives of the assets also require significant judgments. See Note N for further details.
Goodwill and Other Intangible Assets	Goodwill. Goodwill is not amortized; instead, it is reviewed for impairment annually (in the fourth quarter) or more frequently if indicators of impairment exist or if a decision is made to sell or realign a business. A significant amount of judgment is involved in determining if an indicator of impairment has occurred. Such indicators may include deterioration in general economic conditions, negative developments in equity and credit markets, adverse changes in the markets in which an entity operates, increases in input costs that have a negative effect on earnings and cash flows, or a trend of negative or declining cash flows over multiple periods, among others. The fair value that could be realized in an actual transaction may differ from that used to evaluate the impairment of goodwill. Goodwill is allocated among and evaluated for impairment at the reporting unit level, which is defined as an operating segment or one level below an operating segment. Howmet has four reporting units composed of the Engine Products, Fastening Systems, Engineered Structures, and Forged Wheels segments. Howmet determines annually, based on facts and circumstances, which of its reporting units will be subject to the qualitative assessment. Under the qualitative assessment, various events and circumstances (similar to the impairment indicators above) that would affect the estimated fair value of a reporting unit are identified to determine if a quantitative assessment should be performed. Management also considers the most recent forecasted cash flows and discount rates in determining if the prior fair value measurement estimate may be reduced to a level that would indicate impairment is more likely than not and compares the weighted average cost of capital (“WACC”) between the current and prior years for each reporting unit. If management concludes it is more likely than not (greater than 50%) that the estimated fair value of a reporting unit is less than its carrying amount, we will proceed directly to the quantitative impairment test. Howmet will periodically refresh a reporting unit’s fair value measurement and this is based on a number of factors, including how much fair value exceeded carrying value in the most recent quantitative assessment and the reporting unit’s recent performance. Our policy is that a quantitative impairment test be performed for each reporting unit at least once during every three-year period. For those reporting units where a qualitative assessment is either not performed or for which the conclusion is that an impairment is more likely than not, a quantitative impairment test will be performed. Other Intangible Assets. Intangible assets with indefinite useful lives are not amortized while intangible assets with finite useful lives are amortized generally on a straight-line basis over the periods benefited. The following table details the weighted-average useful lives of software and other intangible assets by reporting segment (numbers in years): Software Other intangible assets Engine Products 7 33 Fastening Systems 5 23 Engineered Structures 3 18 Forged Wheels 4 25
Leases	Leases. The Company determines whether a contract contains a lease at inception. The Company leases land and buildings, plant equipment, vehicles, and computer equipment which have been classified as operating leases. Certain real estate leases include one or more options to renew; the exercise of lease renewal options is at the Company’s discretion. The Company includes renewal option periods in the lease term when it is determined that the options are reasonably certain to be exercised. Certain of Howmet’s real estate lease agreements include rental payments that either have fixed contractual increases over time or adjust periodically for inflation. Certain of the Company’s lease agreements include variable lease payments. The variable portion of payments is not included in the initial measurement of the right-of-use asset or lease liability due to the uncertainty of the payment amount and is recorded as lease cost in the period incurred. The Company also rents or subleases certain real estate to third parties, which is not material to the consolidated financial statements. Operating lease right-of-use assets and lease liabilities with an initial term greater than 12 months are recorded on the balance sheet at the present value of the future minimum lease payments over the lease term at the lease commencement date and are recognized as lease expense on a straight-line basis over the lease term. The Company uses an incremental collateralized borrowing rate based on the information available at the lease commencement date in determining the present value of future payments, as most of its leases do not provide an implicit rate. The operating lease right-of-use assets also include any lease prepayments made and are reduced by lease incentives and accrued exit costs.
Environmental Matters	Environmental Matters. Expenditures for current operations are expensed or capitalized, as appropriate. Expenditures relating to existing conditions caused by past operations, which will not contribute to future sales, are expensed. Liabilities are recorded when remediation costs are probable and can be reasonably estimated. The liability may include costs such as site investigations, consultant fees, feasibility studies, outside contractors, and monitoring expenses. Estimates are generally not discounted or reduced by potential claims for recovery. Claims for recovery are recognized when probable and as agreements are reached with third parties. The estimates also include costs related to other potentially responsible parties to the extent that Howmet has reason to believe such parties will not fully pay their proportionate share. The liability is continuously reviewed and adjusted to reflect current remediation progress, prospective estimates of required activity, and other factors that may be relevant, including changes in technology or regulations.
Litigation and Contingent Liabilities	Litigation and Contingent Liabilities. From time to time, we are involved in various lawsuits, claims, investigations, and proceedings. These matters may include speculative claims for substantial or indeterminate amounts of damages. Management determines the likelihood of an unfavorable outcome based on many factors, such as the nature of the matter, available defenses and case strategy, progress of the matter, views and opinions of legal counsel and other advisors, applicability and success of appeals processes, and the outcome of similar historical matters, among others. If an unfavorable outcome is deemed probable and the amount of the potential loss can be estimated, the most reasonable loss estimate is recorded. If an unfavorable outcome of a matter is deemed probable but the loss is not reasonably estimable, or if an unfavorable outcome is deemed reasonably possible, then the matter is disclosed but no liability is recorded. Legal matters are reviewed on a continuous basis to determine if there has been a change in management’s judgment regarding the likelihood of an unfavorable outcome or the estimate of a potential loss.
Revenue Recognition	Revenue Recognition. The Company's contracts with customers are comprised of acknowledged purchase orders incorporating the Company’s standard terms and conditions, or for larger customers, may also generally include terms under negotiated multi-year agreements. These contracts with customers typically consist of the manufacturing of products which represent single performance obligations that are satisfied upon transfer of control of the product to the customer. The Company produces fastening systems; seamless rolled rings; investment castings, including airfoils; extruded, machined and formed aircraft parts; and forged aluminum commercial vehicle wheels. Transfer of control is assessed based on alternative use of the products we produce and our enforceable right to payment for performance to date under the contract terms. Transfer of control and revenue recognition generally occur upon shipment or delivery of the product, which is when title, ownership and risk of loss pass to the customer and is based on the applicable shipping terms. The shipping terms vary across all businesses and depend on the product, the country of origin, and the type of transportation (truck, train, or vessel). An invoice for payment is issued at the time of shipment. Our segments set commercial terms on which Howmet sells products to its customers. These terms are influenced by industry custom, market conditions, product line (specialty versus commodity products), and other considerations. In certain circumstances, Howmet receives advanced payments from its customers for product to be delivered in future periods. These advanced payments are recorded as deferred revenue until the product is delivered and title and risk of loss have passed to the customer in accordance with the terms of the contract. Deferred revenue was $60 and $64 as of December 31, 2024 and 2023, respectively, and is included in Other current liabilities and Other noncurrent liabilities and deferred credits in the Consolidated Balance Sheet.
Income Taxes	Income Taxes. The provision for income taxes is determined using the asset and liability approach of accounting for income taxes. Under this approach, the provision for income taxes represents income taxes paid or payable (or received or receivable) for the current year plus the change in deferred taxes during the year. Deferred taxes represent the future tax consequences expected to occur when the reported amounts of assets and liabilities are recovered or paid, and result from differences between the financial and tax bases of Howmet’s assets and liabilities and are adjusted for changes in tax rates and tax laws when enacted. Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not (greater than 50%) that a tax benefit will not be realized. In evaluating the need for a valuation allowance, management considers all potential sources of taxable income, including income available in carryback periods, future reversals of taxable temporary differences, projections of taxable income, and income from tax planning strategies, as well as all available positive and negative evidence. Positive evidence includes factors such as a history of profitable operations, projections of future profitability within the carryforward period, including from tax planning strategies, and Howmet’s experience with similar operations. Existing favorable contracts and the ability to sell products into established markets are additional positive evidence. Negative evidence includes items such as cumulative losses, projections of future losses, or carryforward periods that are not long enough to allow for the utilization of a deferred tax asset based on existing projections of income. Deferred tax assets for which no valuation allowance is recorded may not be realized upon changes in facts and circumstances, resulting in a future charge to establish a valuation allowance. Existing valuation allowances are re-examined under the same standards of positive and negative evidence. If it is determined that it is more likely than not that a deferred tax asset will be realized, the appropriate amount of the valuation allowance, if any, is released. Deferred tax assets and liabilities are also remeasured to reflect changes in underlying tax rates due to law changes and the granting and lapse of tax holidays. It is Howmet’s policy to apply a tax law ordering approach when considering the need for a valuation allowance on net operating losses expected to offset Global Intangible Low-Taxed Income (“GILTI”) inclusions. Under this approach, reductions in cash tax savings are not considered as part of the valuation allowance assessment. Instead, future GILTI inclusions are considered a source of taxable income that support the realizability of deferred tax assets. It is Howmet’s policy to treat taxes due from future inclusions in United States (“U.S.”) taxable income related to GILTI as a current period expense when incurred. Tax benefits related to uncertain tax positions taken or expected to be taken on a tax return are recorded when such benefits meet a more likely than not threshold. Otherwise, these tax benefits are recorded when a tax position has been effectively settled, which means that the statute of limitations has expired or the appropriate taxing authority has completed their examination even though the statute of limitations remains open. Interest and penalties related to uncertain tax positions are recognized as part of the provision for income taxes and are accrued beginning in the period that such interest and penalties would be applicable under relevant tax law until such time that the related tax benefits are recognized.
Stock-Based Compensation	Stock-Based Compensation. Howmet recognizes compensation expense for employee equity grants using the non-substantive vesting period approach, in which the expense is recognized ratably over the requisite service period based on the grant date fair value. Forfeitures are accounted for as they occur. For restricted stock unit awards, the fair value is equivalent to the closing market price of Howmet’s common stock on the date of grant. The fair value of performance awards containing a market condition is valued using a Monte Carlo valuation model. Determining the fair value at the grant date requires judgment, including estimates for the average risk-free interest rate, dividend yield, volatility, and exercise behavior. These assumptions may differ significantly between grant dates because of changes in the actual results of these inputs that occur over time.
Foreign Currency	Foreign Currency. The local currency is the functional currency for Howmet’s significant operations outside the U.S., except for certain operations in Canada and the United Kingdom (“U.K.”), where the U.S. dollar is used as the functional currency. The determination of the functional currency for Howmet’s operations is made based on the appropriate economic and management indicators.
Derivatives and Hedging	Derivatives and Hedging. Derivatives are held for purposes other than trading and are part of a formally documented risk management program. The Company uses commodity derivative financial instruments to manage its economic risk. For interest rate exposures, we may use interest rate swaps and cross-currency swaps to effect a fixed rate payment and hedge the variability in future payment changes. The Company records derivative instruments on its consolidated balance sheets at fair value and evaluates hedge effectiveness when electing to apply hedge accounting. When electing to apply hedge accounting, the Company formally documents all derivative hedges at inception and the underlying hedged items, as well as the risk management objectives and strategies for undertaking the hedge transaction. For derivatives and debt instruments that are designated and qualify for hedge accounting, changes in the fair value are recorded in Accumulated other comprehensive income (loss). Derivatives that are designated as cash flow hedges are recorded in Accumulated other comprehensive income (loss) and reclassified to the Consolidated Statements of Operations when the effects of the item being hedged are recognized in the Consolidated Statements of Operations. The remeasurements of debt instruments designated as net investment hedges are recorded in Accumulated other comprehensive income (loss) and will be reclassified to earnings only upon the sale or liquidation of the Company’s hedged net investment. Cash flows from derivatives are recognized in the Statement of Consolidated Cash Flows in a manner consistent with the underlying transactions.
Acquisitions	Acquisitions. Howmet’s business acquisitions are accounted for using the acquisition method. The purchase price is allocated to the assets acquired and liabilities assumed based on their estimated fair values. Any excess purchase price over the fair value of the net assets acquired is recorded as goodwill. For all acquisitions, operating results are included in the Statement of Consolidated Operations from the date of the acquisition.
Discontinued Operations and Assets Held for Sale	Discontinued Operations and Assets Held for Sale. For those businesses where management has committed to a plan to divest, each business is valued at the lower of its carrying amount or estimated fair value less cost to sell. If the carrying amount of the business exceeds its estimated fair value, an impairment loss is recognized. Fair value is estimated using accepted valuation techniques such as a DCF model, valuations performed by third parties, earnings multiples, or indicative bids, when available. A number of significant estimates and assumptions are involved in the application of these techniques, including the forecasting of markets and market share, sales volumes and prices, costs and expenses, and multiple other factors. Management considers historical experience and all available information at the time the estimates are made; however, the fair value that is ultimately realized upon the divestiture of a business may differ from the estimated fair value reflected in the Consolidated Financial Statements. Depreciation and amortization expense is not recorded on assets of a business to be divested once they are classified as held for sale. Businesses to be divested are generally classified in the Consolidated Financial Statements as either discontinued operations or held for sale. For businesses classified as discontinued operations, the balance sheet amounts and results of operations are reclassified from their historical presentation to assets and liabilities of discontinued operations on the Consolidated Balance Sheet and to discontinued operations on the Statement of Consolidated Operations, respectively, for all periods presented. The gains or losses associated with these divested businesses are recorded in discontinued operations on the Statement of Consolidated Operations. The Statement of Consolidated Cash Flows is not required to be reclassified for discontinued operations for any period. Segment information does not include the assets or operating results of businesses classified as discontinued operations for all periods presented. These businesses are expected to be disposed of within one year. For businesses classified as held for sale that do not qualify for discontinued operations treatment, the balance sheet and cash flow amounts are reclassified from their historical presentation to assets and liabilities of operations held for sale for all periods presented. The results of operations continue to be reported in continuing operations. The gains or losses associated with these divested businesses are recorded in Restructuring and other charges on the Statement of Consolidated Operations. The segment information includes the assets and operating results of businesses classified as held for sale for all periods presented.
Recently Adopted and Issued Accounting Guidance	Recently Adopted Accounting Guidance. In November 2023, the Financial Accounting Standards Board (“FASB”) issued guidance to enhance disclosures related to significant segment expenses and other matters related to reportable segments. These changes become effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The adoption of this new disclosure is reflected in Note C of the Consolidated Financial Statements. In September 2022, the FASB issued guidance to enhance the transparency of disclosures regarding supplier finance programs. These changes became effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, except for the amendment on rollforward information, which is effective for fiscal years beginning after December 15, 2023. The adoption of this new disclosure is reflected in Note S of the Consolidated Financial Statements. Recently Issued Accounting Guidance. In November 2024, the FASB issued guidance to improve disclosures about an entity’s expenses including more detailed information about the components of expenses in commonly presented expense captions. These changes become effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Management is currently evaluating the impact of these changes on the Consolidated Financial Statements. In December 2023, the FASB issued guidance to enhance the transparency of income tax disclosures including additional details on the rate reconciliation and taxes paid by jurisdiction. These changes become effective for fiscal years beginning after December 15, 2024. Management is currently evaluating the impact of these changes on the Consolidated Financial Statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Schedule of Weighted-average Useful Lives of Structures and Machinery and Equipment	The following table details the weighted-average useful lives of structures and machinery and equipment by reporting segment (numbers in years): Structures Machinery and equipment Engine Products 28 16 Fastening Systems 27 17 Engineered Structures 29 20 Forged Wheels 27 18 December 31, 2024 December 31, 2023 Land and land rights $ 84 $ 88 Structures 1,025 1,018 Machinery and equipment 4,118 4,079 5,227 5,185 Less: accumulated depreciation and amortization 3,150 3,081 2,077 2,104 Construction work-in-progress 309 224 Properties, plants, and equipment, net $ 2,386 $ 2,328
Schedule of Weighted-average Useful Lives of Software and Other Intangibles	The following table details the weighted-average useful lives of software and other intangible assets by reporting segment (numbers in years): Software Other intangible assets Engine Products 7 33 Fastening Systems 5 23 Engineered Structures 3 18 Forged Wheels 4 25

Segment and Geographic Area I_2

Segment and Geographic Area Information (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Schedule of Operating Results and Assets of Arconic's Reportable Segments	The operating results and assets of the Company's reportable segments were as follows: Year ended Engine Products Fastening Systems Engineered Structures Forged Wheels Total 2024 Sales: Third-party sales $ 3,735 $ 1,576 $ 1,065 $ 1,054 $ 7,430 Inter-segment sales 7 1 10 — 18 Total sales $ 3,742 $ 1,577 $ 1,075 $ 1,054 $ 7,448 Expenses: Segment Adjusted cost of goods sold (1) $ 2,495 $ 1,061 $ 873 $ 724 $ 5,153 Other segment items (2) 97 110 36 43 286 Profit and loss: Segment Adjusted EBITDA $ 1,150 $ 406 $ 166 $ 287 $ 2,009 Restructuring and other charges 1 5 12 1 19 Provision for depreciation and amortization 139 47 42 42 270 Other: Capital expenditures $ 219 $ 26 $ 20 $ 45 $ 310 Total assets 5,145 2,711 1,355 701 9,912 2023 Sales: Third-party sales $ 3,266 $ 1,349 $ 878 $ 1,147 $ 6,640 Inter-segment sales 13 — 3 — 16 Total sales $ 3,279 $ 1,349 $ 881 $ 1,147 $ 6,656 Expenses: Segment Adjusted cost of goods sold (1) $ 2,295 $ 959 $ 720 $ 796 $ 4,770 Other segment items (2) 97 112 48 42 299 Profit and loss: Segment Adjusted EBITDA $ 887 $ 278 $ 113 $ 309 $ 1,587 Restructuring and other (credits) charges (2) 1 21 — 20 Provision for depreciation and amortization 130 46 47 39 262 Other: Capital expenditures $ 112 $ 31 $ 26 $ 36 $ 205 Total assets 4,926 2,749 1,415 724 9,814 2022 Sales: Third-party sales $ 2,698 $ 1,117 $ 790 $ 1,058 $ 5,663 Inter-segment sales 4 — 6 — 10 Total sales $ 2,702 $ 1,117 $ 796 $ 1,058 $ 5,673 Expenses: Segment Adjusted cost of goods sold (1) $ 1,881 $ 782 $ 644 $ 745 $ 4,052 Other segment items (2) 92 101 41 35 269 Profit and loss: Segment Adjusted EBITDA $ 729 $ 234 $ 111 $ 278 $ 1,352 Restructuring and other charges 29 8 7 2 46 Provision for depreciation and amortization 125 45 48 40 258 Other: Capital expenditures $ 94 $ 39 $ 17 $ 28 $ 178 Total assets 4,784 2,661 1,273 701 9,419 (1) Segment Adjusted cost of goods sold is exclusive of Provision for depreciation and amortization, Restructuring and other charges, and Corporate expenses. (2) Other segment items includes Selling, general administrative, and other expenses, and Research and development expenses; exclusive of Provision for depreciation and amortization, and Restructuring and other charges. The following table reconciles Total segment capital expenditures, which are presented on an accrual basis, with Capital expenditures as presented on the Statement of Consolidated Cash Flows. Differences between the total segment and consolidated totals are in Corporate, including the impact of changes in accrued capital expenditures during the period. For the year ended December 31, 2024 2023 2022 Total segment capital expenditures $ 310 $ 205 $ 178 Corporate 11 14 15 Capital expenditures $ 321 $ 219 $ 193
Schedule of Segment ATOI to Consolidated Net (loss) Income Attributable to Arconic	The following tables reconcile certain segment information to consolidated totals. Differences between the total segment and consolidated totals are in Corporate. For the year ended December 31, 2024 2023 2022 Total Segment Adjusted EBITDA $ 2,009 $ 1,587 $ 1,352 Segment provision for depreciation and amortization (270) (262) (258) Unallocated amounts: Restructuring and other charges ( D ) (21) (23) (56) Corporate expense (85) (99) (119) Operating income $ 1,633 $ 1,203 $ 919 Loss on debt redemption (6) (2) (2) Interest expense, net (182) (218) (229) Other expense, net ( F ) (62) (8) (82) Income before income taxes $ 1,383 $ 975 $ 606
Schedule of Segment Reporting Information to Consolidated Assets	December 31, 2024 2023 Assets: Total segment assets $ 9,912 $ 9,814 Unallocated amounts: Cash and cash equivalents 564 610 Deferred income taxes 36 46 Corporate fixed assets, net 83 83 Fair value of derivative contracts 4 — Accounts receivable securitization (250) (250) Other 170 125 Consolidated assets $ 10,519 $ 10,428
Schedule of Geographic Information for Sales	Geographic information for sales was as follows (based upon the destination of the sale): For the year ended December 31, 2024 2023 2022 Sales: United States $ 3,713 $ 3,273 $ 2,928 France 678 578 394 Germany 458 363 292 Japan 355 378 319 United Kingdom 350 283 228 Italy 287 220 180 Mexico 220 263 235 Canada 174 145 138 Poland 152 130 96 China 103 98 111 Other 940 909 742 $ 7,430 $ 6,640 $ 5,663
Schedule of Geographic Information for Long-lived Assets	Geographic information for long-lived tangible assets was as follows (based upon the physical location of the assets): December 31, 2024 2023 Long-lived assets: United States $ 1,864 $ 1,760 Hungary 199 200 United Kingdom 121 120 France 112 121 Mexico 68 71 Germany 54 58 China 41 46 Other 82 80 $ 2,541 $ 2,456
Schedule of Disaggregation of Revenue by Major End Market Served	The following table disaggregates segment revenue by major market served. Differences between the total segment and consolidated totals are in Corporate. Engine Products Fastening Systems Engineered Structures Forged Wheels Total Year ended December 31, 2024 Aerospace - Commercial $ 2,091 $ 1,006 $ 774 $ — $ 3,871 Aerospace - Defense 766 162 236 — 1,164 Commercial Transportation — 254 — 1,054 1,308 Industrial and Other 878 154 55 — 1,087 Total end-market revenue $ 3,735 $ 1,576 $ 1,065 $ 1,054 $ 7,430 Year ended December 31, 2023 Aerospace - Commercial $ 1,798 $ 790 $ 641 $ — $ 3,229 Aerospace - Defense 670 173 172 — 1,015 Commercial Transportation — 255 — 1,147 1,402 Industrial and Other 798 131 65 — 994 Total end-market revenue $ 3,266 $ 1,349 $ 878 $ 1,147 $ 6,640 Year ended December 31, 2022 Aerospace - Commercial $ 1,495 $ 616 $ 495 $ — $ 2,606 Aerospace - Defense 526 158 239 — 923 Commercial Transportation — 225 — 1,058 1,283 Industrial and Other 677 118 56 — 851 Total end-market revenue $ 2,698 $ 1,117 $ 790 $ 1,058 $ 5,663

Restructuring and Other Charg_2

Restructuring and Other Charges (Tables)	12 Months Ended
	Dec. 31, 2024
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Other Charges	Restructuring and other charges were comprised of the following: For the year ended December 31, 2024 2023 2022 Layoff costs $ 10 $ 3 $ — Net reversals of previously recorded layoff reserves (3) (1) (1) Pension and other post-retirement benefits - net settlements ( G ) — 5 58 Non-cash asset impairments and accelerated depreciation 2 14 1 Net losses (gains) related to divestitures of assets and businesses ( T ) 12 (1) (8) Other — 3 6 Total restructuring and other charges $ 21 $ 23 $ 56
Schedule of Restructuring and Other Charges by Reportable Segments, Pretax	Activity and reserve balances for restructuring charges were as follows: Layoff Other Total Reserve balances at December 31, 2021 $ 17 $ 2 $ 19 2022 Activity Cash payments (9) (7) (16) Restructuring and other charges 56 — 56 Other (1) (58) 7 (51) Reserve balances at December 31, 2022 $ 6 $ 2 $ 8 2023 Activity Cash payments $ (3) $ (3) $ (6) Restructuring and other charges 7 16 23 Other (2) (5) (13) (18) Reserve balances at December 31, 2023 $ 5 $ 2 $ 7 2024 Activity Cash payments $ (8) $ (2) $ (10) Restructuring and other charges 7 14 21 Other (3) — (14) (14) Reserve balances at December 31, 2024 $ 4 $ — $ 4 (1) In 2022, other for layoff costs included $58 in settlement accounting charges related to U.S. and U.K. pension plans; while other for other exit costs included a gain of $8 on the sale of assets, which was offset by a $1 charge for accelerated depreciation. (2) In 2023, other for layoff costs included $5 in settlement accounting charges related to U.S. and Canadian pension plans; while other for other exit costs included charges of $12 related to the impairment of assets and a $2 charge for accelerated depreciation which was offset by a gain of $1 on the sale of assets. (3) In 2024, other for other exit costs included a net loss of $13 on the sale of a small U.K. manufacturing facility and a charge of $2 for accelerated depreciation, partially offset by a gain on the sale of assets at a small U.K. manufacturing facility in Engine Products of $1.

Interest Cost Components (Table

Interest Cost Components (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of Interest Cost Components	For the year ended December 31, 2024 2023 2022 Amount charged to interest expense, net $ 182 $ 218 $ 229 Loss on debt redemption ( Q ) 6 2 2 Amount capitalized 7 6 6 Total interest cost $ 195 $ 226 $ 237

Other Expense, Net (Tables)

Other Expense, Net (Tables)	12 Months Ended
	Dec. 31, 2024
Other Income and Expenses [Abstract]
Schedule of Other Expense, Net	Other Expense, Net For the year ended December 31, 2024 2023 2022 Non-service costs - pension and other postretirement benefits ( G ) $ 29 $ 29 $ 16 Interest income (20) (23) (6) Foreign currency losses (gains), net 13 (2) (1) Net realized and unrealized losses (1) 25 22 18 Deferred compensation 15 10 (8) Legal proceeding (2) — (25) 65 Other, net — (3) (2) Total other expense, net $ 62 $ 8 $ 82 (1) In all periods presented, Net realized and unrealized losses primarily includes costs associated with sales under the Company’s accounts receivables securitization arrangement and sales of other customer receivables (See Note L ). (2) In 2023, due to the final settlement of the Lehman Brothers International (Europe) legal proceeding (See Note U ) , L egal proceeding included the reversal of $25, net of legal fees of $1, of the $65 pre-tax charge taken in 2022.

Pension and Other Postretirem_2

Pension and Other Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Schedule of Obligations and Funded Status	Obligations and Funded Status Pension benefits Other December 31, 2024 2023 2024 2023 Change in benefit obligation Benefit obligation at beginning of year $ 1,592 $ 1,599 $ 103 $ 120 Service cost 3 3 1 1 Interest cost 75 80 5 7 Amendments — — (2) (10) Actuarial (gains) losses (1) (58) 50 (36) (1) Settlements — (31) — — Benefits paid (112) (118) (11) (14) Foreign currency translation impact (4) 9 — — Benefit obligation at end of year (2) $ 1,496 $ 1,592 $ 60 $ 103 Change in plan assets (2) Fair value of plan assets at beginning of year $ 925 $ 970 $ — $ — Actual (loss) return on plan assets (8) 57 — — Employer contributions 79 36 — — Benefits paid (95) (101) — — Administrative expenses (12) (13) — — Settlement payments — (32) — — Foreign currency translation impact (3) 8 — — Fair value of plan assets at end of year (2) $ 886 $ 925 $ — $ — Funded status $ (610) $ (667) $ (60) $ (103) Amounts recognized in the Consolidated Balance Sheet consist of: Noncurrent assets $ 31 $ 13 $ — $ — Current liabilities (16) (16) (6) (11) Noncurrent liabilities (625) (664) (54) (92) Net amount recognized $ (610) $ (667) $ (60) $ (103) Amounts recognized in Accumulated Other Comprehensive Loss consist of: Net actuarial loss (gain) $ 956 $ 960 $ (59) $ (26) Prior service cost (benefit) 2 2 (33) (41) Net amount recognized, before tax effect $ 958 $ 962 $ (92) $ (67) Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of: Net actuarial cost (benefit) $ 28 $ 86 $ (36) $ (1) Amortization of accumulated net actuarial (loss) benefit (32) (33) 3 3 Prior service benefit — — (2) (10) Amortization of prior service benefit — — 10 9 Net amount recognized, before tax effect $ (4) $ 53 $ (25) $ 1 (1) As of December 31, 2024, the actuarial gains impacting the benefit obligation were primarily due to changes in the discount rate, partially offset by asset returns being lower than expected. At December 31, 2023, the actuarial losses impacting the benefit obligation were primarily due to changes in the discount rate as well as asset returns being lower than expected. (2) As of December 31, 2024, the benefit obligation, fair value of plan assets, and funded status for U.S. pension plans were $1,356, $739, and $(617), respectively. As of December 31, 2023, the benefit obligation, fair value of plan assets, and funded status for U.S. pension plans were $1,434, $780, and $(654), respectively.
Schedule of Pension Plan Benefit Obligations	Pension Plan Benefit Obligations Pension benefits 2024 2023 The projected benefit obligation and accumulated benefit obligation for all defined benefit pension plans were as follows: Projected benefit obligation $ 1,496 $ 1,592 Accumulated benefit obligation 1,495 1,591 The aggregate projected benefit obligation and fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets were as follows: Projected benefit obligation 1,380 1,459 Fair value of plan assets 739 780 The aggregate accumulated benefit obligation and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets were as follows: Accumulated benefit obligation 1,379 1,459 Fair value of plan assets 739 780
Components of Net Periodic Benefit Cost	Components of Net Periodic Benefit Cost Pension benefits (1) Other postretirement benefits For the year ended December 31, 2024 2023 2022 2024 2023 2022 Service cost $ 3 $ 3 $ 4 $ 1 $ 1 $ 2 Interest cost 75 80 51 5 7 4 Expected return on plan assets (70) (74) (80) — — — Recognized net actuarial loss (gain) 32 28 49 (3) (3) 1 Amortization of prior service benefit — — — (10) (9) (9) Settlements (2) — 5 58 — — — Net periodic benefit cost (3) $ 40 $ 42 $ 82 $ (7) $ (4) $ (2) (1) In 2024, 2023, and 2022, net periodic benefit cost for U.S. pension plans was $40, $40, and $79, respectively. (2) In 2023, settlements were related to U.S. and Canadian actions including an annuity buyout and lump sum benefit payments. In 2022, settlements were related to U.S. and U.K. lump sum benefit payments. (3) Service cost was included within Cost of goods sold and Selling, general administrative, and other expenses; settlements were included in Restructuring and other charges; all other cost components were recorded in Other expense, net in the Statement of Consolidated Operations.
Schedule of Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost	Assumptions Weighted average assumptions used to determine benefit obligations for pension and other postretirement benefit plans were as follows: December 31, 2024 2023 Discount rate 5.60 % 5.10 % Cash balance plan interest crediting rate 3.00 % 3.00 % Weighted average assumptions used to determine net periodic benefit cost for pension and other postretirement benefit plans were as follows: 2024 2023 2022 Discount rate to calculate service cost (1) 5.10 % 5.50 % 2.80 % Discount rate to calculate interest cost (1) 4.90 % 5.30 % 2.50 % Expected long-term rate of return on plan assets 6.70 % 6.70 % 6.70 % Cash balance plan interest crediting rate 3.00 % 3.00 % 3.00 % (1) In all periods presented, the respective global discount rates were used to determine net periodic benefit cost for most pension plans for the full annual period. The discount rates for certain plans were updated during 2024, 2023, and 2022 to reflect the remeasurement of these plans due to amendments, settlements, and/or curtailments. The weighted-average rates reflecting these remeasurements does not significantly differ from the rates presented.
Schedule of Assumed Health Care Cost Trend Rates	Assumed health care cost trend rates for U.S. other postretirement benefit plans were as follows: 2024 2023 2022 Health care cost trend rate assumed for next year 5.50 % 5.50 % 5.50 % Rate to which the cost trend rate gradually declines 4.50 % 4.50 % 4.50 % Year that the rate reaches the rate at which it is assumed to remain 2027 2026 2025
Schedule of Pension and Postretirement Plans Investment Policy and Weighted Average Asset Allocations	Howmet’s pension plans’ investment policy as of December 31, 2024 by asset class, were as follows: Asset class Policy range (1) Equities 20–55% Fixed income 25–55% Other investments 15–35% (1) Policy range is for U.S. plan assets only, as both the U.K. and Canadian asset investment allocations are controlled by a third-party trustee with input from Howmet.
Schedule of Fair Value of Pension Plan Assets	The following table presents the fair value of pension plan assets classified under the appropriate level of the fair value hierarchy or net asset value: December 31, 2024 Level 1 Level 2 Net Asset Value Total Equities: Equity securities $ 1 $ 130 $ 300 $ 431 Long/short equity hedge funds — — 20 20 Private equity — — 112 112 $ 1 $ 130 $ 432 $ 563 Fixed income: Intermediate and long duration government/credit $ 71 $ 57 $ — $ 128 Other 18 66 — 84 $ 89 $ 123 $ — $ 212 Other investments: Real estate $ — $ 1 $ 54 $ 55 Discretionary and systematic macro hedge funds — — 40 40 Other — — 5 5 $ — $ 1 $ 99 $ 100 Net plan assets (1) $ 90 $ 254 $ 531 $ 875 December 31, 2023 Level 1 Level 2 Net Asset Value Total Equities: Equity securities $ — $ 85 $ 225 $ 310 Long/short equity hedge funds — — 18 18 Private equity — — 108 108 $ — $ 85 $ 351 $ 436 Fixed income: Intermediate and long duration government/credit $ 199 $ 151 $ — $ 350 Other 6 63 — 69 $ 205 $ 214 $ — $ 419 Other investments: Real estate $ — $ 5 $ 68 $ 73 Discretionary and systematic macro hedge funds — — 29 29 Other — — 3 3 $ — $ 5 $ 100 $ 105 Net plan assets (2) $ 205 $ 304 $ 451 $ 960 (1) As of December 31, 2024, the total fair value of pension plans’ assets excludes a net receivable of $11, which represents securities purchased and sold but not yet settled plus interest and dividends earned on various investments. (2) As of December 31, 2023, the total fair value of pension plans’ assets excludes a net payable of $35, which represents securities purchased and sold but not yet settled offset by interest and dividends earned on various investments.
Schedule of Benefit Payments Expected to be Paid and Expected Medicare Part D Subsidy Receipts	Benefit payments expected to be paid to pension and other postretirement benefit plans’ participants utilizing the current assumptions outlined above are as follows: For the year ended December 31, Pension Other post- 2025 $ 138 $ 6 2026 133 6 2027 131 6 2028 131 6 2029 126 6 2030 - 2034 576 26 Total $ 1,235 $ 56

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Components of Income from Continuing Operations Before Income Taxes	The components of income before income taxes were as follows: For the year ended December 31, 2024 2023 2022 United States $ 901 $ 538 $ 287 Foreign 482 437 319 Total $ 1,383 $ 975 $ 606
Schedule of Provision for Income Taxes on Income from Continuing Operations	The provision for income taxes consisted of the following: For the year ended December 31, 2024 2023 2022 Current: Federal (1) $ 70 $ 5 $ 3 Foreign 98 94 53 State and local 4 2 — 172 101 56 Deferred: Federal 43 92 71 Foreign 17 16 5 State and local (4) 1 5 56 109 81 Total $ 228 $ 210 $ 137 (1) Federal includes U.S. taxes related to foreign income.
Schedule of Reconciliation of U.S. Federal Statutory Rate to Arconic's Effective Tax Rate	A reconciliation of the U.S. federal statutory rate to Howmet’s effective tax rate was as follows (the effective tax rate for 2024, 2023, and 2022 was a provision on income): For the year ended December 31, 2024 2023 2022 U.S. federal statutory rate 21.0 % 21.0 % 21.0 % Foreign tax rate differential 0.7 (0.1) 0.1 U.S. and residual tax on foreign earnings (1) (0.6) 0.6 1.2 U.S. state and local taxes, net of federal income tax effect 1.0 0.7 0.5 Non-deductible officer compensation 0.7 0.7 1.2 Tax holidays (0.4) (0.4) (0.5) Tax credits (2) (5.1) (0.7) (0.9) Changes in valuation allowances (0.6) (1.1) 1.4 Changes in uncertain tax positions (3) — 2.1 — Excess benefit for stock compensation (0.7) (0.8) (0.8) Other 0.5 (0.5) (0.6) Effective tax rate 16.5 % 21.5 % 22.6 % (1) It is Howmet’s policy to treat taxes due from future inclusions in U.S. taxable income related to GILTI as a current period expense when incurred. (2) In 2024, the Company completed an R&D study, and as a result recorded a discrete tax benefit for $42 of prior year federal R&D credits approved under audit by the U.S. Internal Revenue Service and $8 of prior year state R&D credits. The Company also recorded a tax benefit for federal and state R&D credits earned during the current year of $13 and $3, respectively. (3) In 2023, the Company recorded an income tax reserve of $21 related to an uncertain French tax position.
Schedule of Components of Net Deferred Tax Assets and Liabilities	The components of net deferred tax assets and liabilities were as follows: 2024 2023 December 31, Deferred Deferred Deferred Deferred Depreciation $ 8 $ 529 $ 8 $ 510 R&D capitalization 73 — 24 — Employee benefits 232 9 240 4 Loss provisions 11 2 28 1 Deferred income/expense 46 293 32 1,210 Interest 6 — 32 — Tax loss carryforwards 1,941 — 2,905 — Tax credit carryforwards 110 — 216 — Other 5 8 10 4 $ 2,432 $ 841 $ 3,495 $ 1,729 Valuation allowance (1,705) — (1,821) — Total $ 727 $ 841 $ 1,674 $ 1,729
Schedule of Expiration Periods of Deferred Tax Assets	The following table details the expiration periods of the deferred tax assets presented above: December 31, 2024 Expires Expires No Expiration (1) Other (2) Total Tax loss carryforwards $ 427 $ 393 $ 1,121 $ — $ 1,941 Tax credit carryforwards 94 7 9 — 110 Other (3) — — 345 36 381 Valuation allowance (481) (324) (897) (3) (1,705) Total $ 40 $ 76 $ 578 $ 33 $ 727 (1) Deferred tax assets with no expiration may still have annual limitations on utilization. (2) Other represents deferred tax assets whose expiration is dependent upon the reversal of the underlying temporary difference. (3) A substantial amount of Other deferred tax assets relates to employee benefits that will become deductible for tax purposes in jurisdictions with unlimited expiration over an extended period of time as contributions are made to employee benefit plans and payments are made to retirees.
Schedule of Changes in Valuation Allowance	The following table details the changes in the valuation allowance: December 31, 2024 2023 2022 Balance at beginning of year $ 1,821 $ 1,965 $ 2,279 Increase to allowance 20 21 40 Release of allowance (127) (198) (154) Acquisitions, divestitures and liquidations 75 (16) — Tax apportionment, tax rate and tax law changes (2) (11) (110) Foreign currency translation (82) 60 (90) Balance at end of year $ 1,705 $ 1,821 $ 1,965
Schedule of Reconciliation of Unrecognized Tax Benefits (Excluding Interest and Penalties)	A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding interest and penalties) was as follows: December 31, 2024 2023 2022 Balance at beginning of year $ 16 $ 2 $ 2 Additions for tax positions of the current year — 1 — Additions for tax positions of prior years — 13 — Settlements with tax authorities (14) — — Foreign currency translation (1) — — Balance at end of year $ 1 $ 16 $ 2

Preferred and Common Stock (Tab

Preferred and Common Stock (Tables)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Schedule of Share Activity	Common Stock Outstanding and Share Activity (number of shares) Balance at December 31, 2021 421,691,912 Issued for stock-based compensation plans 1,819,651 Repurchase and retirement of common stock (11,356,506) Balance at December 31, 2022 412,155,057 Issued for stock-based compensation plans 2,993,340 Repurchase and retirement of common stock (5,233,936) Balance at December 31, 2023 409,914,461 Issued for stock-based compensation plans 1,287,412 Repurchase and retirement of common stock (5,770,512) Balance at December 31, 2024 405,431,361
Schedule of Accelerated Share Repurchases	The following table provides details for share repurchases during 2024, 2023, and 2022: Number of shares Average price per share (1) Total Q1 2024 open market repurchase 2,243,259 $66.87 $150 Q2 2024 open market repurchase 734,737 $81.66 $60 Q3 2024 open market repurchase 1,061,323 $94.22 $100 Q4 2024 open market repurchase 1,731,193 $109.75 $190 2024 Share repurchase total 5,770,512 $86.65 $500 Q1 2023 open market repurchase 576,629 $43.36 $25 Q2 2023 open market repurchase 2,246,294 $44.52 $100 Q3 2023 open market repurchase 506,800 $49.32 $25 Q4 2023 open market repurchase 1,904,213 $52.52 $100 2023 Share repurchase total 5,233,936 $47.76 $250 Q1 2022 open market repurchase 5,147,307 $34.00 $175 Q2 2022 open market repurchase 1,770,271 $33.89 $60 Q3 2022 open market repurchase 2,764,846 $36.17 $100 Q4 2022 open market repurchase 1,674,082 $38.83 $65 2022 Share repurchase total 11,356,506 $35.22 $400 (1) Excludes commissions cost.
Schedule of Activity for Stock Options and Stock Awards	The activity for stock options and stock awards during 2024 was as follows (options and awards in millions in the table below): Stock options Stock awards Number of Weighted Number of Weighted Outstanding, December 31, 2023 0.5 $ 22.67 3.0 $ 34.23 Granted — — 0.7 71.65 Exercised (0.4) 23.41 — — Converted — — (1.6) 32.11 Expired or forfeited — — (0.1) 43.89 Performance share adjustment — — 0.1 35.97 Outstanding, December 31, 2024 0.1 $ 20.98 2.1 $ 48.28

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Schedule of Reconciliation of Information Used to Compute Basic and Diluted EPS	The information used to compute basic and diluted EPS attributable to Howmet common shareholders was as follows (shares in millions in the table below): For the year ended December 31, 2024 2023 2022 Net income attributable to common shareholders $ 1,155 $ 765 $ 469 Less: preferred stock dividends declared 2 2 2 Net income available to Howmet Aerospace common shareholders - basic and diluted $ 1,153 $ 763 $ 467 Average shares outstanding - basic 408 412 416 Effect of dilutive securities: Stock and performance awards 2 4 5 Average shares outstanding - diluted 410 416 421

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss by Component	The following table details the activity of the three components that comprise Accumulated other comprehensive loss: 2024 2023 2022 Pension and other postretirement benefits ( G ) Balance at beginning of period $ (689) $ (653) $ (799) Other comprehensive (loss) income: Unrecognized net actuarial gain (loss) and prior service cost/benefit 3 (68) 87 Tax (expense) benefit (1) 15 (18) Total Other comprehensive income (loss) before reclassifications, net of tax 2 (53) 69 Amortization of net actuarial loss and prior service cost (1) 19 21 99 Tax expense (2) (4) (4) (22) Total amount reclassified from Accumulated other comprehensive loss, net of tax (3) 15 17 77 Total Other comprehensive income (loss) 17 (36) 146 Balance at end of period $ (672) $ (689) $ (653) Foreign currency translation Balance at beginning of period $ (1,136) $ (1,193) $ (1,062) Other comprehensive (loss) income (4) (71) 57 (131) Balance at end of period $ (1,207) $ (1,136) $ (1,193) Cash flow hedges Balance at beginning of period $ (5) $ 5 $ (2) Other comprehensive (loss) income: Net change from periodic revaluations — (19) (8) Tax benefit (expense) — 4 2 Total Other comprehensive (loss) income before reclassifications, net of tax — (15) (6) Net amount reclassified to earnings (5) 8 6 17 Tax (expense) benefit (2) (2) (1) (4) Total amount reclassified from Accumulated other comprehensive income (loss), net of tax (3) 6 5 13 Total Other comprehensive income (loss) 6 (10) 7 Balance at end of period $ 1 $ (5) $ 5 Accumulated other comprehensive loss balance at end of period $ (1,878) $ (1,830) $ (1,841) (1) These amounts were recorded in Restructuring and other charges (See Note D ) and Other expense, net (See Note F ) in the Statement of Consolidated Operations. (2) These amounts were included in Provision for income taxes (See Note H ) in the Statement of Consolidated Operations. (3) A positive amount indicates a corresponding charge to earnings and a negative amount indicates a corresponding benefit to earnings. (4) In all periods presented, no amounts were reclassified to earnings. (5) These amounts were recorded in Cost of goods sold in the Statement of Consolidated Operations.

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2024
Inventory Disclosure [Abstract]
Schedule of Inventory Components	December 31, 2024 2023 Finished goods $ 458 $ 451 Work-in-process 903 891 Purchased raw materials 408 355 Operating supplies 71 68 Total inventories $ 1,840 $ 1,765

Properties, Plants, and Equip_2

Properties, Plants, and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Schedule of Properties, Plants, and Equipment, Net	The following table details the weighted-average useful lives of structures and machinery and equipment by reporting segment (numbers in years): Structures Machinery and equipment Engine Products 28 16 Fastening Systems 27 17 Engineered Structures 29 20 Forged Wheels 27 18 December 31, 2024 December 31, 2023 Land and land rights $ 84 $ 88 Structures 1,025 1,018 Machinery and equipment 4,118 4,079 5,227 5,185 Less: accumulated depreciation and amortization 3,150 3,081 2,077 2,104 Construction work-in-progress 309 224 Properties, plants, and equipment, net $ 2,386 $ 2,328

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Amount of Goodwill	The following table details the changes in the carrying amount of goodwill: Engine Products Fastening Systems Engineered Structures Forged Wheels Total Balances at December 31, 2022 Goodwill $ 2,830 $ 1,595 $ 306 $ 7 $ 4,738 Accumulated impairment losses (719) (4) (2) — (725) Goodwill, net 2,111 1,591 304 7 4,013 Translation and other 13 9 — — 22 Balances at December 31, 2023 Goodwill 2,843 1,604 306 7 4,760 Accumulated impairment losses (719) (4) (2) — (725) Goodwill, net 2,124 1,600 304 7 4,035 Translation and other (17) (7) (1) — (25) Balances at December 31, 2024 Goodwill 2,826 1,597 305 7 4,735 Accumulated impairment losses (719) (4) (2) — (725) Goodwill, net $ 2,107 $ 1,593 $ 303 $ 7 $ 4,010
Schedule of Other Intangible Assets	Other intangible assets were as follows: December 31, 2024 Gross carrying amount Accumulated Intangibles, net Computer software $ 217 $ (185) $ 32 Patents and licenses 66 (66) — Other intangibles 689 (268) 421 Total amortizable intangible assets 972 (519) 453 Indefinite-lived trade names and trademarks 22 — 22 Total intangible assets, net $ 994 $ (519) $ 475 December 31, 2023 Gross carrying amount Accumulated Intangibles, net Computer software $ 217 $ (182) $ 35 Patents and licenses 67 (66) 1 Other intangibles 683 (246) 437 Total amortizable intangible assets 967 (494) 473 Indefinite-lived trade names and trademarks 32 — 32 Total intangible assets, net $ 999 $ (494) $ 505

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Schedule of Supplemental Balance Sheet Information Related to Leases	Operating lease right-of-use assets and lease liabilities in the Consolidated Balance Sheet were as follows: December 31, 2024 2023 Right-of-use assets classified in Other noncurrent assets $ 155 $ 128 Current portion of lease liabilities classified in Other current liabilities $ 37 $ 32 Long-term portion of lease liabilities classified in Other noncurrent liabilities and deferred credits 119 97 Total lease liabilities $ 156 $ 129
Schedule of Future Minimum Contractual Operating Lease Obligations	Future minimum contractual operating lease obligations were as follows at December 31, 2024: 2025 $ 46 2026 39 2027 29 2028 21 2029 15 Thereafter 39 Total lease payments $ 189 Less: Imputed interest (33) Present value of lease liabilities $ 156
Schedule of Other Lease Information	December 31, 2024 2023 2022 Right-of-use assets obtained in exchange for operating lease obligations $ 66 $ 68 $ 34 Weighted-average remaining lease term in years 5.9 6.4 5.6 Weighted-average discount rate 5.7 % 5.9 % 5.4 % Cash paid for interest and income taxes was as follows: 2024 2023 2022 Interest, net of amounts capitalized $ 180 $ 221 $ 224 Income taxes, net of amounts refunded $ 177 $ 104 $ 50

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Debt. December 31, 2024 2023 5.125% Notes, due 2024 $ — $ 205 6.875% Notes, due 2025 — 600 USD Term Loan Agreement, due 2026 140 200 JPY Term Loan Agreement, due 2026 188 211 5.900% Notes, due 2027 625 625 6.750% Bonds, due 2028 300 300 3.000% Notes, due 2029 700 700 4.850% Notes, due 2031 (1) 500 — 5.950% Notes, due 2037 625 625 4.750% Iowa Finance Authority Loan, due 2042 250 250 Other, net (2) (13) (10) 3,315 3,706 Less: amount due within one year 6 206 Total long-term debt $ 3,309 $ 3,500 (1) The Company entered into a cross-currency swap to synthetically convert the 2031 Notes into a Euro liability of approximately €458 million with a fixed annual interest rate of 3.720%. (2) Other, net includes unamortized debt discounts and unamortized debt issuance costs related to outstanding notes and bonds listed in the table above and various financing arrangements related to subsidiaries.

Other Financial Instruments (Ta

Other Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Carrying Values and Fair Values of Other Financial Instruments	2024 2023 December 31, Carrying Fair Carrying Fair Long-term debt, less amount due within one year $ 3,309 $ 3,298 $ 3,500 $ 3,504

Cash Flow Information (Tables)

Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2024
Supplemental Cash Flow Information [Abstract]
Schedule of Cash Paid for Interest and Income Taxes	December 31, 2024 2023 2022 Right-of-use assets obtained in exchange for operating lease obligations $ 66 $ 68 $ 34 Weighted-average remaining lease term in years 5.9 6.4 5.6 Weighted-average discount rate 5.7 % 5.9 % 5.4 % Cash paid for interest and income taxes was as follows: 2024 2023 2022 Interest, net of amounts capitalized $ 180 $ 221 $ 224 Income taxes, net of amounts refunded $ 177 $ 104 $ 50
Summary of Supplier Financing Program	The rollforward of the Company’s outstanding obligations confirmed as valid under its supplier financing program Confirmed obligations outstanding at December 31, 2023 $ 258 Invoices confirmed during the year 877 Confirmed invoices paid during the year (867) Confirmed obligations outstanding at December 31, 2024 $ 268

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) reporting_unit	Dec. 31, 2023 USD ($)	Dec. 31, 2022
Summary Of Significant Accounting Policies [Line Items]
Number of reporting units | reporting_unit	4
Minimum percentage of estimated fair value of reporting unit to be less than carrying amount of goodwill	50%
Period required for impairment testing of reporting units	3 years
Deferred revenue | $	$ 60	$ 64
Businesses expected to be disposed within, years	1 year
Aerospace - Commercial | Revenue Benchmark | Customer Concentration Risk
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	52%	49%	46%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Weighted-average Useful Lives of Structures and Machinery and Equipment (Details)	Dec. 31, 2024
Structures | Engine Products
Property, Plant and Equipment [Line Items]
Weighted-average useful lives of assets, years	28 years
Structures | Fastening Systems
Property, Plant and Equipment [Line Items]
Weighted-average useful lives of assets, years	27 years
Structures | Engineered Structures
Property, Plant and Equipment [Line Items]
Weighted-average useful lives of assets, years	29 years
Structures | Forged Wheels
Property, Plant and Equipment [Line Items]
Weighted-average useful lives of assets, years	27 years
Machinery and equipment | Engine Products
Property, Plant and Equipment [Line Items]
Weighted-average useful lives of assets, years	16 years
Machinery and equipment | Fastening Systems
Property, Plant and Equipment [Line Items]
Weighted-average useful lives of assets, years	17 years
Machinery and equipment | Engineered Structures
Property, Plant and Equipment [Line Items]
Weighted-average useful lives of assets, years	20 years
Machinery and equipment | Forged Wheels
Property, Plant and Equipment [Line Items]
Weighted-average useful lives of assets, years	18 years

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Weighted-average Useful Lives of Software and Other Intangible Assets (Details)	Dec. 31, 2024
Software | Engine Products
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives of other intangible assets	7 years
Software | Fastening Systems
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives of other intangible assets	5 years
Software | Engineered Structures
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives of other intangible assets	3 years
Software | Forged Wheels
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives of other intangible assets	4 years
Other intangibles | Engine Products
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives of other intangible assets	33 years
Other intangibles | Fastening Systems
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives of other intangible assets	23 years
Other intangibles | Engineered Structures
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives of other intangible assets	18 years
Other intangibles | Forged Wheels
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives of other intangible assets	25 years

Segment and Geographic Area I_3

Segment and Geographic Area Information - Narrative (Details) - segment	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Number of reportable segments	4
Revenue Benchmark | Product Concentration Risk | Aerospace
Segment Reporting Information [Line Items]
Concentration risk, percentage	68%	64%	62%
Revenue Benchmark | Customer Concentration Risk | Aerospace | General Electric Company
Segment Reporting Information [Line Items]
Concentration risk, percentage	10%
Revenue Benchmark | Customer Concentration Risk | Aerospace | RTX Corporation
Segment Reporting Information [Line Items]
Concentration risk, percentage	10%

Segment and Geographic Area I_4

Segment and Geographic Area Information - Schedule of Operating Results of Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Sales	$ 7,430	$ 6,640	$ 5,663
Restructuring and other (credits) charges	21	23	56
Provision for depreciation and amortization	277	272	265
Capital expenditures	321	219	193
Total assets	10,519	10,428
Engine Products
Segment Reporting Information [Line Items]
Sales	3,735	3,266	2,698
Fastening Systems
Segment Reporting Information [Line Items]
Sales	1,576	1,349	1,117
Engineered Structures
Segment Reporting Information [Line Items]
Sales	1,065	878	790
Forged Wheels
Segment Reporting Information [Line Items]
Sales	1,054	1,147	1,058
Operating segments
Segment Reporting Information [Line Items]
Sales	7,448	6,656	5,673
Segment Adjusted cost of goods sold	5,153	4,770	4,052
Other segment items	286	299	269
Segment Adjusted EBITDA	2,009	1,587	1,352
Restructuring and other (credits) charges	19	20	46
Provision for depreciation and amortization	270	262	258
Capital expenditures	310	205	178
Total assets	9,912	9,814	9,419
Operating segments | Engine Products
Segment Reporting Information [Line Items]
Sales	3,742	3,279	2,702
Segment Adjusted cost of goods sold	2,495	2,295	1,881
Other segment items	97	97	92
Segment Adjusted EBITDA	1,150	887	729
Restructuring and other (credits) charges	1	(2)	29
Provision for depreciation and amortization	139	130	125
Capital expenditures	219	112	94
Total assets	5,145	4,926	4,784
Operating segments | Fastening Systems
Segment Reporting Information [Line Items]
Sales	1,577	1,349	1,117
Segment Adjusted cost of goods sold	1,061	959	782
Other segment items	110	112	101
Segment Adjusted EBITDA	406	278	234
Restructuring and other (credits) charges	5	1	8
Provision for depreciation and amortization	47	46	45
Capital expenditures	26	31	39
Total assets	2,711	2,749	2,661
Operating segments | Engineered Structures
Segment Reporting Information [Line Items]
Sales	1,075	881	796
Segment Adjusted cost of goods sold	873	720	644
Other segment items	36	48	41
Segment Adjusted EBITDA	166	113	111
Restructuring and other (credits) charges	12	21	7
Provision for depreciation and amortization	42	47	48
Capital expenditures	20	26	17
Total assets	1,355	1,415	1,273
Operating segments | Forged Wheels
Segment Reporting Information [Line Items]
Sales	1,054	1,147	1,058
Segment Adjusted cost of goods sold	724	796	745
Other segment items	43	42	35
Segment Adjusted EBITDA	287	309	278
Restructuring and other (credits) charges	1	0	2
Provision for depreciation and amortization	42	39	40
Capital expenditures	45	36	28
Total assets	701	724	701
Inter-segment sales
Segment Reporting Information [Line Items]
Sales	(18)	(16)	(10)
Inter-segment sales | Engine Products
Segment Reporting Information [Line Items]
Sales	(7)	(13)	(4)
Inter-segment sales | Fastening Systems
Segment Reporting Information [Line Items]
Sales	(1)	0	0
Inter-segment sales | Engineered Structures
Segment Reporting Information [Line Items]
Sales	(10)	(3)	(6)
Inter-segment sales | Forged Wheels
Segment Reporting Information [Line Items]
Sales	$ 0	$ 0	$ 0

Segment and Geographic Area I_5

Segment and Geographic Area Information - Schedule of Capital Expenditure (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Capital expenditures	$ 321	$ 219	$ 193
Operating segments
Segment Reporting Information [Line Items]
Capital expenditures	310	205	178
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	$ 11	$ 14	$ 15

Segment and Geographic Area I_6

Segment and Geographic Area Information - Schedule of Segment Operating Profit to Consolidated Net Income (loss) Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Provision for depreciation and amortization	$ (277)	$ (272)	$ (265)
Restructuring and other charges	(21)	(23)	(56)
Operating income	1,633	1,203	919
Loss on debt redemption	(6)	(2)	(2)
Interest expense, net (E)	(182)	(218)	(229)
Other expense, net (F)	(62)	(8)	(82)
Income before income taxes	1,383	975	606
Operating segments
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	2,009	1,587	1,352
Provision for depreciation and amortization	(270)	(262)	(258)
Restructuring and other charges	(19)	(20)	(46)
Corporate
Segment Reporting Information [Line Items]
Restructuring and other charges	(21)	(23)	(56)
Corporate expense	$ (85)	$ (99)	$ (119)

Segment and Geographic Area I_7

Segment and Geographic Area Information - Schedule of Segment Reporting Information to Consolidated Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets:
Assets	$ 10,519	$ 10,428
Cash and cash equivalents	564	610
Corporate fixed assets, net	2,386	2,328
Operating segments
Assets:
Assets	9,912	9,814	$ 9,419
Corporate
Assets:
Cash and cash equivalents	564	610
Deferred income taxes	36	46
Corporate fixed assets, net	83	83
Fair value of derivative contracts	4	0
Accounts receivable securitization	(250)	(250)
Other	$ 170	$ 125

Segment and Geographic Area I_8

Segment and Geographic Area Information - Schedule of Geographic Information for Sales (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	$ 7,430	$ 6,640	$ 5,663
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	3,713	3,273	2,928
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	678	578	394
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	458	363	292
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	355	378	319
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	350	283	228
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	287	220	180
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	220	263	235
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	174	145	138
Poland
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	152	130	96
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	103	98	111
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	$ 940	$ 909	$ 742

Segment and Geographic Area I_9

Segment and Geographic Area Information - Schedule of Geographic Information for Long-lived Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 2,541	$ 2,456
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	1,864	1,760
Hungary
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	199	200
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	121	120
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	112	121
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	68	71
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	54	58
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	41	46
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 82	$ 80

Segment and Geographic Area _10

Segment and Geographic Area Information - Schedule of Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue, Major Customer [Line Items]
Sales	$ 7,430	$ 6,640	$ 5,663
Engine Products
Revenue, Major Customer [Line Items]
Sales	3,735	3,266	2,698
Fastening Systems
Revenue, Major Customer [Line Items]
Sales	1,576	1,349	1,117
Engineered Structures
Revenue, Major Customer [Line Items]
Sales	1,065	878	790
Forged Wheels
Revenue, Major Customer [Line Items]
Sales	1,054	1,147	1,058
Aerospace - Commercial
Revenue, Major Customer [Line Items]
Sales	3,871	3,229	2,606
Aerospace - Commercial | Engine Products
Revenue, Major Customer [Line Items]
Sales	2,091	1,798	1,495
Aerospace - Commercial | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	1,006	790	616
Aerospace - Commercial | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	774	641	495
Aerospace - Commercial | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0	0
Aerospace - Defense
Revenue, Major Customer [Line Items]
Sales	1,164	1,015	923
Aerospace - Defense | Engine Products
Revenue, Major Customer [Line Items]
Sales	766	670	526
Aerospace - Defense | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	162	173	158
Aerospace - Defense | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	236	172	239
Aerospace - Defense | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0	0
Commercial Transportation
Revenue, Major Customer [Line Items]
Sales	1,308	1,402	1,283
Commercial Transportation | Engine Products
Revenue, Major Customer [Line Items]
Sales	0	0	0
Commercial Transportation | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	254	255	225
Commercial Transportation | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	0	0	0
Commercial Transportation | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	1,054	1,147	1,058
Industrial and Other
Revenue, Major Customer [Line Items]
Sales	1,087	994	851
Industrial and Other | Engine Products
Revenue, Major Customer [Line Items]
Sales	878	798	677
Industrial and Other | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	154	131	118
Industrial and Other | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	55	65	56
Industrial and Other | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	$ 0	$ 0	$ 0

Restructuring and Other Charg_3

Restructuring and Other Charges - Schedule of Restructuring and Other Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring and Related Activities [Abstract]
Layoff costs	$ 10	$ 3	$ 0
Net reversals of previously recorded layoff reserves	(3)	(1)	(1)
Pension and other post-retirement benefits - net settlements (G)	0	5	58
Non-cash asset impairments and accelerated depreciation	2	14	1
Net losses (gains) related to divestitures of assets and businesses (T)	12	(1)	(8)
Other	0	3	6
Total restructuring and other charges	$ 21	$ 23	$ 56

Restructuring and Other Charg_4

Restructuring and Other Charges - Narrative (Details) $ in Millions		12 Months Ended
	May 31, 2024 USD ($)	Dec. 31, 2024 USD ($) employee	Dec. 31, 2023 USD ($) employee	Dec. 31, 2022 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and other (credits) charges		$ 21	$ 23	$ 56
Gain (loss) on disposition of assets		(25)	(22)	(18)
Layoff costs		$ 10	3	0
Number of employees associated with layoff costs | employee		431
Accelerated depreciation		$ 2
Net reversals of previously recorded layoff reserves		3	1	1
Asset impairment charges		2	14	1
Other exit costs		$ 0	$ 3	6
2024 Restructuring Programs
Restructuring Cost and Reserve [Line Items]
Number of employees separated | employee		355,000,000
Fastening Systems
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | employee		283
Engineered Structures
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | employee		111	63
Accelerated depreciation				1
Asset impairment charges			$ 12
Engineered Structures | U.K.
Restructuring Cost and Reserve [Line Items]
Gain (loss) on disposition of assets	$ (13)	$ (13)
Accelerated depreciation			2
Engineered Structures | U.S.
Restructuring Cost and Reserve [Line Items]
Gain (loss) on disposition of assets			1
Forged Wheels
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | employee		37
Engine Products | U.K.
Restructuring Cost and Reserve [Line Items]
Gain (loss) on disposition of assets		$ 1
Engine Products | U.S.
Restructuring Cost and Reserve [Line Items]
Gain (loss) on disposition of assets				8
Pension benefits
Restructuring Cost and Reserve [Line Items]
Pension and other post-retirement benefits - net settlement			$ 5	$ 58

Restructuring and Other Charg_5

Restructuring and Other Charges - Schedule of Restructuring and Other Charges by Reportable Segments, Pretax (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	May 31, 2024	Jun. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Restructuring reserve beginning balance			$ 7	$ 8	$ 19
Cash payments			(10)	(6)	(16)
Restructuring and other charges			21	23	56
Other			(14)	(18)	(51)
Restructuring reserve ending balance			4	7	8
Settlements			0	5	58
Gain (loss) on disposition of assets			(25)	(22)	(18)
Accelerated depreciation			2
Asset impairment charges			2	14	1
Engineered Structures
Restructuring Reserve [Roll Forward]
Accelerated depreciation					1
Asset impairment charges				12
United Kingdom | Engineered Structures
Restructuring Reserve [Roll Forward]
Gain (loss) on disposition of assets	$ (13)		(13)
Accelerated depreciation				2
United Kingdom | Engine Products
Restructuring Reserve [Roll Forward]
Gain (loss) on disposition of assets			1
Pension benefits
Restructuring Reserve [Roll Forward]
Settlements		$ 3	0	5	58
Layoff costs
Restructuring Reserve [Roll Forward]
Restructuring reserve beginning balance			5	6	17
Cash payments			(8)	(3)	(9)
Restructuring and other charges			7	7	56
Other			0	(5)	(58)
Restructuring reserve ending balance			4	5	6
Layoff costs | Pension benefits | U.S. and U.K.
Restructuring Reserve [Roll Forward]
Settlements					58
Layoff costs | Pension benefits | U.S. and Canada
Restructuring Reserve [Roll Forward]
Settlements				5
Other exit costs
Restructuring Reserve [Roll Forward]
Restructuring reserve beginning balance			2	2	2
Cash payments			(2)	(3)	(7)
Restructuring and other charges			14	16	0
Other			(14)	(13)	7
Restructuring reserve ending balance			$ 0	2	2
Gain (loss) on disposition of assets				1	8
Accelerated depreciation				2	$ 1
Asset impairment charges				$ 12

Interest Cost Components (Detai

Interest Cost Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Amount charged to interest expense, net	$ 182	$ 218	$ 229
Loss on debt redemption (Q)	6	2	2
Amount capitalized	7	6	6
Total interest cost	$ 195	$ 226	$ 237

Other Expense, Net - Schedule o

Other Expense, Net - Schedule of Other Expense, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Income and Expenses [Abstract]
Non-service costs - pension and other postretirement benefits (G)	$ 29	$ 29	$ 16
Interest income	(20)	(23)	(6)
Foreign currency losses (gains), net	13	(2)	(1)
Net realized and unrealized losses	25	22	18
Deferred compensation	15	10	(8)
Legal proceeding	0	(25)	65
Other, net	0	(3)	(2)
Total other expense, net	$ 62	$ 8	$ 82

Other Expense, Net - Narrative

Other Expense, Net - Narrative (Details) - Lehman Brothers International (Europe) (“LBIE”) Claims - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Reversal of previously recorded litigation amount	$ 25
Legal fees	$ 1
Loss contingency, provision		$ 65

Pension and Other Postretirem_3

Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Jul. 31, 2023	Jun. 30, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Change in accrued other postretirement benefits liability			$ 10
Settlements						$ 0	$ 5	$ 58
Average duration for plans' projected cash flows (in years)						9 years
Period expected long-term rate of return is applied (in years)						5 years
Expected long-term rate of return on plan assets						6.70%	6.70%	6.70%
Number of years over actual annual healthcare cost trend experience						20 years
Health care cost trend rate assumed for next year		5.50%				5.50%	5.50%	5.50%
Defined benefit plan, ultimate health care cost trend rate		4.50%				4.50%	4.50%	4.50%
Pension contributions						$ 79	$ 36	$ 43
Contribution next fiscal year						60
Expenses related to defined contribution plan						$ 92	82	76
Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, ultimate health care cost trend rate						(0.40%)
Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, ultimate health care cost trend rate						1.50%
United States
Defined Benefit Plan Disclosure [Line Items]
Pension contributions						$ 79	36
Contribution next fiscal year						44
United States | Scenario, forecast
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets					7%
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Settlements				$ 3		0	5	58
Pension benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in obligation, pension benefits	$ 19
Settlements								41
Pension benefits | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in obligation, pension benefits		$ 2
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Settlements						$ 0	0	0
Number of years over actual annual healthcare cost trend experience						3 years
Pension Settlement Cost
Defined Benefit Plan Disclosure [Line Items]
Restructuring and other charges							$ 2	$ 17

Pension and Other Postretirem_4

Pension and Other Postretirement Benefits - Schedule of Obligations and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension benefits
Change in benefit obligation
Benefit obligation at beginning of year	$ 1,592	$ 1,599
Service cost	3	3	$ 4
Interest cost	75	80	51
Amendments	0	0
Actuarial (gains) losses	(58)	50
Settlements	0	(31)
Benefits paid	(112)	(118)
Foreign currency translation impact	(4)	9
Benefit obligation at end of year	1,496	1,592	1,599
Change in plan assets
Fair value of plan assets at beginning of year	925	970
Actual (loss) return on plan assets	(8)	57
Employer contributions	79	36
Benefits paid	(95)	(101)
Administrative expenses	(12)	(13)
Settlement payments	0	(32)
Foreign currency translation impact	(3)	8
Fair value of plan assets at end of year	886	925	970
Funded status	(610)	(667)
Amounts recognized in the Consolidated Balance Sheet consist of:
Noncurrent assets	31	13
Current liabilities	(16)	(16)
Noncurrent liabilities	(625)	(664)
Net amount recognized	(610)	(667)
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Net actuarial loss (gain)	956	960
Prior service cost (benefit)	2	2
Net amount recognized, before tax effect	958	962
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of:
Net actuarial cost (benefit)	28	86
Amortization of accumulated net actuarial (loss) benefit	(32)	(33)
Prior service benefit	0	0
Amortization of prior service benefit	0	0
Net amount recognized, before tax effect	(4)	53
Pension benefits | United States
Change in benefit obligation
Benefit obligation at beginning of year	1,434
Benefit obligation at end of year	1,356	1,434
Change in plan assets
Fair value of plan assets at beginning of year	780
Fair value of plan assets at end of year	739	780
Funded status	(617)	(654)
Other postretirement benefits
Change in benefit obligation
Benefit obligation at beginning of year	103	120
Service cost	1	1	2
Interest cost	5	7	4
Amendments	(2)	(10)
Actuarial (gains) losses	(36)	(1)
Settlements	0	0
Benefits paid	(11)	(14)
Foreign currency translation impact	0	0
Benefit obligation at end of year	60	103	120
Change in plan assets
Fair value of plan assets at beginning of year	0	0
Actual (loss) return on plan assets	0	0
Employer contributions	0	0
Benefits paid	0	0
Administrative expenses	0	0
Settlement payments	0	0
Foreign currency translation impact	0	0
Fair value of plan assets at end of year	0	0	$ 0
Funded status	(60)	(103)
Amounts recognized in the Consolidated Balance Sheet consist of:
Noncurrent assets	0	0
Current liabilities	(6)	(11)
Noncurrent liabilities	(54)	(92)
Net amount recognized	(60)	(103)
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Net actuarial loss (gain)	(59)	(26)
Prior service cost (benefit)	(33)	(41)
Net amount recognized, before tax effect	(92)	(67)
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of:
Net actuarial cost (benefit)	(36)	(1)
Amortization of accumulated net actuarial (loss) benefit	3	3
Prior service benefit	(2)	(10)
Amortization of prior service benefit	10	9
Net amount recognized, before tax effect	$ (25)	$ 1

Pension and Other Postretirem_5

Pension and Other Postretirement Benefits - Schedule of Pension Plan Benefit Obligations (Details) - Pension benefits - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 1,496	$ 1,592	$ 1,599
Accumulated benefit obligation	1,495	1,591
The aggregate projected benefit obligation and fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets were as follows:
Projected benefit obligation	1,380	1,459
Fair value of plan assets	739	780
The aggregate accumulated benefit obligation and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets were as follows:
Accumulated benefit obligation	1,379	1,459
Fair value of plan assets	$ 739	$ 780

Pension and Other Postretirem_6

Pension and Other Postretirement Benefits - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Settlements		$ 0	$ 5	$ 58
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		3	3	4
Interest cost		75	80	51
Expected return on plan assets		(70)	(74)	(80)
Recognized net actuarial loss (gain)		32	28	49
Amortization of prior service benefit		0	0	0
Settlements	$ 3	0	5	58
Net periodic benefit cost		40	42	82
Pension benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Settlements				41
Net periodic benefit cost		40	40	79
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		1	1	2
Interest cost		5	7	4
Expected return on plan assets		0	0	0
Recognized net actuarial loss (gain)		(3)	(3)	1
Amortization of prior service benefit		(10)	(9)	(9)
Settlements		0	0	0
Net periodic benefit cost		$ (7)	$ (4)	$ (2)

Pension and Other Postretirem_7

Pension and Other Postretirement Benefits - Schedule of Weighted Average Assumptions Used to Determine Benefit Obligations (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	5.60%	5.10%
Cash balance plan interest crediting rate	3%	3%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate to calculate service cost	5.10%	5.50%	2.80%
Discount rate to calculate interest cost	4.90%	5.30%	2.50%
Expected long-term rate of return on plan assets	6.70%	6.70%	6.70%
Cash balance plan interest crediting rate	3%	3%	3%

Pension and Other Postretirem_8

Pension and Other Postretirement Benefits - Schedule of Assumed Health Care Cost Trend Rates (Details)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Health care cost trend rate assumed for next year	5.50%	5.50%	5.50%
Rate to which the cost trend rate gradually declines	4.50%	4.50%	4.50%

Pension and Other Postretirem_9

Pension and Other Postretirement Benefits - Schedule of Pension and Postretirement Plans Investment Policy and Weighted Average Asset Allocations (Details)	Dec. 31, 2024
Equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Policy range	20%
Equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Policy range	55%
Fixed income | Minimum
Defined Benefit Plan Disclosure [Line Items]
Policy range	25%
Fixed income | Maximum
Defined Benefit Plan Disclosure [Line Items]
Policy range	55%
Other investments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Policy range	15%
Other investments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Policy range	35%

Pension and Other Postretire_10

Pension and Other Postretirement Benefits - Schedule of Fair Value of Pension Plan Assets (Details) - Pension benefits - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	$ 886	$ 925	$ 970
Securities purchased and sold but not yet settled
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	875	960
Equities:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	563	436
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	431	310
Long/short equity hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	20	18
Private equity
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	112	108
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	212	419
Intermediate and long duration government/credit
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	128	350
Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	84	69
Other investments:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	100	105
Real estate
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	55	73
Discretionary and systematic macro hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	40	29
Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	5	3
Securities purchased and sold but not yet settled, asset (liability)
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	11	(35)
Level 1 | Securities purchased and sold but not yet settled
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	90	205
Level 1 | Equities:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	1	0
Level 1 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	1	0
Level 1 | Long/short equity hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 1 | Private equity
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	89	205
Level 1 | Intermediate and long duration government/credit
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	71	199
Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	18	6
Level 1 | Other investments:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 1 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 1 | Discretionary and systematic macro hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 2 | Securities purchased and sold but not yet settled
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	254	304
Level 2 | Equities:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	130	85
Level 2 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	130	85
Level 2 | Long/short equity hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 2 | Private equity
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	123	214
Level 2 | Intermediate and long duration government/credit
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	57	151
Level 2 | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	66	63
Level 2 | Other investments:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	1	5
Level 2 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	1	5
Level 2 | Discretionary and systematic macro hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 2 | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Net Asset Value | Securities purchased and sold but not yet settled
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	531	451
Net Asset Value | Equities:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	432	351
Net Asset Value | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	300	225
Net Asset Value | Long/short equity hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	20	18
Net Asset Value | Private equity
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	112	108
Net Asset Value | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Net Asset Value | Intermediate and long duration government/credit
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Net Asset Value | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Net Asset Value | Other investments:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	99	100
Net Asset Value | Real estate
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	54	68
Net Asset Value | Discretionary and systematic macro hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	40	29
Net Asset Value | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	$ 5	$ 3

Pension and Other Postretire_11

Pension and Other Postretirement Benefits - Schedule of Funding and Cash Flows and Defined Contribution Plans (Details) $ in Millions	Dec. 31, 2024 USD ($)
Pension benefits
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2025	$ 138
2026	133
2027	131
2028	131
2029	126
2030 - 2034	576
Total benefit payments	1,235
Other postretirement benefits
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2025	6
2026	6
2027	6
2028	6
2029	6
2030 - 2034	26
Total benefit payments	$ 56

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Income from Continuing Operations Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
United States	$ 901	$ 538	$ 287
Foreign	482	437	319
Income before income taxes	$ 1,383	$ 975	$ 606

Income Taxes - Schedule of Prov

Income Taxes - Schedule of Provision for Income Taxes on Income from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current:
Federal	$ 70	$ 5	$ 3
Foreign	98	94	53
State and local	4	2	0
Current provision for income taxes, total	172	101	56
Deferred:
Federal	43	92	71
Foreign	17	16	5
State and local	(4)	1	5
Deferred provision for income taxes, total	56	109	81
Total	$ 228	$ 210	$ 137

Income Taxes - Schedule of Reco

Income Taxes - Schedule of Reconciliation of U.S. Federal Statutory Rate to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	21%	21%	21%
Foreign tax rate differential	0.70%	(0.10%)	0.10%
U.S. and residual tax on foreign earnings	(0.60%)	0.60%	1.20%
U.S. state and local taxes, net of federal income tax effect	1%	0.70%	0.50%
Non-deductible officer compensation	0.70%	0.70%	1.20%
Tax holidays	(0.40%)	(0.40%)	(0.50%)
Tax credits	(5.10%)	(0.70%)	(0.90%)
Changes in valuation allowances	(0.60%)	(1.10%)	1.40%
Changes in uncertain tax positions	0%	2.10%	0%
Excess benefit for stock compensation	(0.70%)	(0.80%)	(0.80%)
Other	0.50%	(0.50%)	(0.60%)
Effective tax rate	16.50%	21.50%	22.60%
Income tax reserve related to uncertain tax position		$ 21
Federal
Tax Credit Carryforward [Line Items]
Tax credit, research, amount	$ 13	42
State and Local
Tax Credit Carryforward [Line Items]
Tax credit, research, amount	$ 3	$ 8

Income Taxes - Schedule of Co_2

Income Taxes - Schedule of Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets
Depreciation	$ 8	$ 8
R&D capitalization	73	24
Employee benefits	232	240
Loss provisions	11	28
Deferred income/expense	46	32
Interest	6	32
Tax loss carryforwards	1,941	2,905
Tax credit carryforwards	110	216
Other	5	10
Deferred tax assets, gross	2,432	3,495
Valuation allowance	(1,705)	(1,821)	$ (1,965)	$ (2,279)
Deferred tax assets, net	727	1,674
Deferred tax liabilities
Depreciation	529	510
R&D capitalization	0	0
Employee benefits	9	4
Loss provisions	2	1
Deferred income/expense	293	1,210
Interest	0	0
Tax loss carryforwards	0	0
Tax credit carryforwards	0	0
Other	8	4
Deferred tax liabilities, gross	$ 841	$ 1,729

Income Taxes - Schedule of Expi

Income Taxes - Schedule of Expiration Periods of Deferred Tax Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Tax Credit Carryforward [Line Items]
Tax loss carryforwards	$ 1,941
Tax credit carryforwards	110
Other	381
Valuation allowance	(1,705)	$ (1,821)	$ (1,965)	$ (2,279)
Deferred tax assets, net	727	$ 1,674
Expires within 10 years
Tax Credit Carryforward [Line Items]
Tax loss carryforwards	427
Tax credit carryforwards	94
Other	0
Valuation allowance	(481)
Deferred tax assets, net	40
Expires within 11-20 years
Tax Credit Carryforward [Line Items]
Tax loss carryforwards	393
Tax credit carryforwards	7
Other	0
Valuation allowance	(324)
Deferred tax assets, net	76
No Expiration
Tax Credit Carryforward [Line Items]
Tax loss carryforwards	1,121
Tax credit carryforwards	9
Other	345
Valuation allowance	(897)
Deferred tax assets, net	578
Other
Tax Credit Carryforward [Line Items]
Tax loss carryforwards	0
Tax credit carryforwards	0
Other	36
Valuation allowance	(3)
Deferred tax assets, net	$ 33

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Contingency [Line Items]
Temporary differences that reverses (as a percent)	5%
Temporary differences that reverses within the carryforward period (as a percent)	95%
Foreign tax credits	$ 46	$ 20
Increase (decrease) to valuation allowance	20	21	$ 40
Cumulative amount of valuation allowance	41
Valuation allowance	1,705	1,821	1,965	$ 2,279
Income taxes, net of amounts refunded	$ 177	$ 104	$ 50
Percentage of the effect of unrecognized tax benefit, if recorded (less than)	1%	2%	1%
Interest or penalties recognized (less than for 2022)	$ 1	$ 7	$ 1
Income related to accrued interest and penalties (less than for 2022)	0	2	1
Amount accrued for payment of interest and penalties (less than for 2022)	9	11	1
State and Local
Income Tax Contingency [Line Items]
Increase (decrease) to valuation allowance	(7)	(2)	(1)
Foreign | UK Tax Authority
Income Tax Contingency [Line Items]
Increase (decrease) to valuation allowance			(6)
Foreign Tax Credit Carryover
Income Tax Contingency [Line Items]
Increase (decrease) to valuation allowance	(4)	(14)
Other Net State Deferred Tax Asset | State and Local
Income Tax Contingency [Line Items]
Increase (decrease) to valuation allowance	(30)	$ (49)	$ (142)
Valuation allowance	$ 401

Income Taxes - Schedule of Chan

Income Taxes - Schedule of Changes in Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation Of Changes In Valuation Allowance [Roll Forward]
Balance at beginning of year	$ 1,821	$ 1,965	$ 2,279
Increase to allowance	20	21	40
Release of allowance	(127)	(198)	(154)
Acquisitions, divestitures and liquidations	75	(16)	0
Tax apportionment, tax rate and tax law changes	(2)	(11)	(110)
Foreign currency translation	(82)	60	(90)
Balance at end of year	$ 1,705	$ 1,821	$ 1,965

Income Taxes - Schedule of Re_2

Income Taxes - Schedule of Reconciliation of Unrecognized Tax Benefits (Excluding Interest and Penalties) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 16	$ 2	$ 2
Additions for tax positions of the current year	0	1	0
Additions for tax positions of prior years	0	13	0
Settlements with tax authorities	(14)	0	0
Foreign currency translation	(1)	0	0
Balance at end of year	$ 1	$ 16	$ 2

Preferred and Common Stock - Na

Preferred and Common Stock - Narrative (Details) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended												12 Months Ended
	Jan. 31, 2025 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)	Dec. 31, 2024 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) $ / shares	Jun. 30, 2024 USD ($) $ / shares	Mar. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares	Jun. 30, 2023 USD ($) $ / shares	Mar. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares	Jun. 30, 2022 USD ($) $ / shares	Mar. 31, 2022 USD ($) $ / shares	Dec. 31, 2024 USD ($) class $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Jul. 30, 2024 USD ($)	Aug. 18, 2021 USD ($)
Preferred Stock
Preferred stock, number of classes | class															2
Common Stock
Common stock, shares authorized (in shares) | shares			600,000,000												600,000,000
Common Stock, Par or Stated Value Per Share | $ / shares			$ 1												$ 1
Common stock issued (in shares) | shares			405,431,361												405,431,361
Common stock outstanding (in shares) | shares			405,431,361				410,000,000				412,000,000				405,431,361	410,000,000	412,000,000
Common (in usd per share) | $ / shares															$ 0.26	$ 0.17	$ 0.10
Dividends paid per share (in usd per share) | $ / shares			$ 0.08	$ 0.08	$ 0.05	$ 0.05	$ 0.05	$ 0.04	$ 0.04	$ 0.04	$ 40,000	$ 0.02	$ 0.02	$ 0.02
Number of shares available for issuance (in shares) | shares			47,000,000												47,000,000
Common stock reserved for future issuance (in shares) | shares			24,000,000												24,000,000
Total value of shares repurchased			$ 190	$ 100	$ 60	$ 150	$ 100	$ 25	$ 100	$ 25	$ 65	$ 100	$ 60	$ 175	$ 500	$ 250	$ 400
Average price per share (in usd per share) | $ / shares			$ 109.75	$ 94.22	$ 81.66	$ 66.87	$ 52.52	$ 49.32	$ 44.52	$ 43.36	$ 38.83	$ 36.17	$ 33.89	$ 34	$ 86.65	$ 47.76	$ 35.22
Stock repurchase program, remaining repurchase amount			$ 2,147												$ 2,147
Stock repurchase program, authorized amount																		$ 2,000	$ 1,500
Excise tax on net repurchases															4	$ 1
Stock-based Compensation
Stock-based compensation		$ 12													63	50	$ 54
Stock based compensation expense, after tax															$ 57	$ 44	$ 49
Average risk-free interest rate. percentage															4.40%	4.40%	2%
Number of options, outstanding weighted average remaining contractual life															2 years 1 month 6 days
Total intrinsic value of options outstanding			13												$ 13
Proceeds from exercise of employee stock options															8	$ 11	$ 16
Total tax benefit realized from these exercises															3	2	2
Total intrinsic value of options exercised															16	9	10
Total intrinsic value of options exercised converted															$ 117	187	61
Subsequent Event
Common Stock
Total value of shares repurchased	$ 50
Average price per share (in usd per share) | $ / shares	$ 116,390,000
Value of shares repurchased | shares	400,000
Employee stock option
Stock-based Compensation
Stock options granted, vesting period															3 years
Share-based compensation arrangement by share-based payment award, expiration period															10 years
Stock options granted, contractual term															6 months
Employee stock option | Share-based Compensation Award, Tranche One
Stock-based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage															33.33%
Employee stock option | Share-based Compensation Award, Tranche Two
Stock-based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage															33.33%
Employee stock option | Share-based Compensation Award, Tranche Three
Stock-based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage															33.33%
Restricted Stock Units (RSUs)
Stock-based Compensation
Stock options granted, contractual term															3 years
Stock-based compensation capitalized															$ 0	$ 0	$ 0
Stock-based compensation expense capitalized			$ 28												$ 28
Unrecognized compensation costs on non-vested awards, weighted average period of recognition in years															1 year 7 months 6 days
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value (in usd per share) | $ / shares															$ 72.65	$ 47.59	$ 44.44
Volatility, percentage															27.70%	39%	39.40%
Preferred Class A
Preferred Stock
Preferred stock dividend declared (usd per share) | $ / shares															$ 3.75	$ 3.75	$ 3.75
Number of shares of preferred stock authorized (in shares) | shares			660,000												660,000
Preferred stock par value (usd per share) | $ / shares			$ 100												$ 100
Preferred stock, shares outstanding (in shares) | shares			546,024				546,024								546,024	546,024
Preferred Class B
Preferred Stock
Number of shares of preferred stock authorized (in shares) | shares			10,000,000												10,000,000
Preferred stock par value (usd per share) | $ / shares			$ 1												$ 1
Preferred stock, shares outstanding (in shares) | shares			0				0								0	0

Preferred and Common Stock - Sc

Preferred and Common Stock - Schedule of Share Activity (Details) - shares	1 Months Ended	12 Months Ended
	Jan. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock outstanding, beginning balance (in shares)	405,431,361	410,000,000	412,000,000
Common stock outstanding, ending balance (in shares)		405,431,361	410,000,000	412,000,000
Subsequent Event
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase and retirement of common stock (in shares)	(400,000)
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock outstanding, beginning balance (in shares)	405,431,361	409,914,461	412,155,057	421,691,912
Issued for stock-based compensation plans (in shares)		1,287,412	2,993,340	1,819,651
Repurchase and retirement of common stock (in shares)		(5,770,512)	(5,233,936)	(11,356,506)
Common stock outstanding, ending balance (in shares)		405,431,361	409,914,461	412,155,057

Preferred and Common Stock - _2

Preferred and Common Stock - Schedule of Details For the Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity [Abstract]
Number of shares (in shares)	1,731,193	1,061,323	734,737	2,243,259	1,904,213	506,800	2,246,294	576,629	1,674,082	2,764,846	1,770,271	5,147,307	5,770,512	5,233,936	11,356,506
Average price per share (in usd per share)	$ 109.75	$ 94.22	$ 81.66	$ 66.87	$ 52.52	$ 49.32	$ 44.52	$ 43.36	$ 38.83	$ 36.17	$ 33.89	$ 34	$ 86.65	$ 47.76	$ 35.22
Total	$ 190	$ 100	$ 60	$ 150	$ 100	$ 25	$ 100	$ 25	$ 65	$ 100	$ 60	$ 175	$ 500	$ 250	$ 400

Preferred and Common Stock - _3

Preferred and Common Stock - Schedule of Activity for Stock Options and Stock Awards (Details) shares in Millions	12 Months Ended
	Dec. 31, 2024 $ / shares shares
Number of options
Number of options outstanding at the beginning of the year (in shares) | shares	0.5
Number of options, granted (in shares) | shares	0
Number of options, exercised (in shares) | shares	(0.4)
Number of options, converted (in shares) | shares	0
Number of options, expired or forfeited (in shares) | shares	0
Number of options, performance share adjustment (in shares) | shares	0
Number of options outstanding at the ending of the year (in shares) | shares	0.1
Weighted average exercise price per option
Weighted average exercise price per option, outstanding beginning of year (in usd per share) | $ / shares	$ 22.67
Weighted average exercise price per option, granted (in usd per share) | $ / shares	0
Weighted average exercise price per option, exercised (in usd per share) | $ / shares	23.41
Weighted average exercise price per option, converted (in usd per share) | $ / shares	0
Weighted average exercise price per option, expired or forfeited (in usd per share) | $ / shares	0
Weighted average exercise price, performance share adjustment (in usd per share) | $ / shares	0
Weighted average exercise price per option, outstanding ending of year (in usd per share) | $ / shares	$ 20.98
Number of awards
Number of awards, outstanding beginning of year (in shares) | shares	3
Number of awards, granted (in shares) | shares	0.7
Number of awards, exercised (in shares) | shares	0
Number of awards, converted (in shares) | shares	(1.6)
Number of awards, expired or forfeited (in shares) | shares	(0.1)
Number of awards, performance share adjustment (in shares) | shares	0.1
Number of awards, outstanding ending of year (in shares) | shares	2.1
Weighted average FMV per award
Weighted average FMV per award, outstanding beginning of year (in usd per share) | $ / shares	$ 34.23
Weighted average FMV per award, granted (in usd per share) | $ / shares	71.65
Weighted average FMV per award, exercised (in usd per share) | $ / shares	0
Weighted average FMV per award, converted (in usd per share) | $ / shares	32.11
Weighted average FMV per award, expired or forfeited (in usd per share) | $ / shares	43.89
Weighted average FMV per award, performance share adjustment (in usd per share) | $ / shares	35.97
Weighted average FMV per award, outstanding, ending of year (in usd per share) | $ / shares	$ 48.28

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation of Information Used to Compute Basic and Diluted EPS (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net income attributable to common shareholders	$ 1,155	$ 765	$ 469
Less: preferred stock dividends declared	2	2	2
Net income available to Howmet Aerospace common shareholders - basic	1,153	763	467
Net income available to Howmet Aerospace common shareholders - diluted	$ 1,153	$ 763	$ 467
Average shares outstanding - basic (in shares)	408	412	416
Effect of dilutive securities:
Stock and performance awards (in shares)	2	4	5
Average shares outstanding - diluted (in shares)	410	416	421

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock outstanding (in shares)	405,431,361	410,000,000	412,000,000
Employee stock option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive securities (in shares)	0	0	0

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 4,037	$ 3,601	$ 3,508
Other comprehensive (loss) income:
Tax (expense) benefit			(4)
Total Other comprehensive (loss) income, net of tax	(48)	11	22
Ending balance	4,554	4,037	3,601
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,830)	(1,841)	(1,863)
Other comprehensive (loss) income:
Total Other comprehensive (loss) income, net of tax	(48)	11	22
Ending balance	(1,878)	(1,830)	(1,841)
Pension and other postretirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(689)	(653)	(799)
Other comprehensive (loss) income:
Other comprehensive gain (loss) income, before reclassifications, before tax	3	(68)	87
Tax (expense) benefit	(1)	15	(18)
Total Other comprehensive (loss) income before reclassifications, net of tax	2	(53)	69
Net amount reclassified to earnings (5)	19	21	99
Tax (expense) benefit	(4)	(4)	(22)
Total amount reclassified from Accumulated other comprehensive loss, net of tax	15	17	77
Total Other comprehensive (loss) income, net of tax	17	(36)	146
Ending balance	(672)	(689)	(653)
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,136)	(1,193)	(1,062)
Other comprehensive (loss) income:
Total Other comprehensive (loss) income, net of tax	(71)	57	(131)
Ending balance	(1,207)	(1,136)	(1,193)
Cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(5)	5	(2)
Other comprehensive (loss) income:
Other comprehensive gain (loss) income, before reclassifications, before tax	0	(19)	(8)
Tax (expense) benefit	0	4	2
Total Other comprehensive (loss) income before reclassifications, net of tax	0	(15)	(6)
Net amount reclassified to earnings (5)	8	6	17
Tax (expense) benefit	(2)	(1)
Total amount reclassified from Accumulated other comprehensive loss, net of tax	6	5	13
Total Other comprehensive (loss) income, net of tax	6	(10)	7
Ending balance	$ 1	$ (5)	$ 5

Receivables (Details)

Receivables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Certain Customers
Schedule Of Financial Receivables [Line Items]
Accounts receivable, sale	$ 712	$ 593
Accounts receivable sale, amount outstanding	190	158
Receivables Purchase Agreement
Schedule Of Financial Receivables [Line Items]
Accounts receivable securitization following a provision to increase the limit	325
Accounts receivable securitization	250
Accounts receivable securitization amount drawn	250	250
Financing receivables, held as collateral	201	197
Accounts receivable, sale	$ 1,625	$ 1,547

Inventories - Schedule of Inven

Inventories - Schedule of Inventory Components (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Finished goods	$ 458	$ 451
Work-in-process	903	891
Purchased raw materials	408	355
Operating supplies	71	68
Total inventories	$ 1,840	$ 1,765

Inventories - Narrative (Detail

Inventories - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024
Inventory Disclosure [Abstract]
Inventories valued on a LIFO basis	$ 446		$ 544
Total inventories valued on an average-cost basis	236		$ 280
LIFO inventory layer liquidations	$ 1	$ (1)

Properties, Plants, and Equip_3

Properties, Plants, and Equipment, Net - Schedule of Properties, Plants, and Equipment, Net (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Properties, plants, and equipment, net	$ 2,386	$ 2,328
Property, Plant and Equipment, Excluding Construction in Progress
Property, Plant and Equipment [Line Items]
Properties, plants, and equipment, gross	5,227	5,185
Less: accumulated depreciation and amortization	3,150	3,081
Properties, plants, and equipment, net	2,077	2,104
Land and land rights
Property, Plant and Equipment [Line Items]
Properties, plants, and equipment, gross	84	88
Structures
Property, Plant and Equipment [Line Items]
Properties, plants, and equipment, gross	1,025	1,018
Machinery and equipment
Property, Plant and Equipment [Line Items]
Properties, plants, and equipment, gross	4,118	4,079
Construction work-in-progress
Property, Plant and Equipment [Line Items]
Properties, plants, and equipment, gross	$ 309	$ 224

Properties, Plants, and Equip_4

Properties, Plants, and Equipment, Net - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Depreciation	$ 243	$ 236	$ 227

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill	$ 4,735	$ 4,760	$ 4,738
Accumulated impairment losses	(725)	(725)	(725)
Goodwill, net	4,035	4,013
Translation and other	(25)	22
Goodwill, net	4,010	4,035
Engine Products
Goodwill [Roll Forward]
Goodwill	2,826	2,843	2,830
Accumulated impairment losses	(719)	(719)	(719)
Goodwill, net	2,124	2,111
Translation and other	(17)	13
Goodwill, net	2,107	2,124
Fastening Systems
Goodwill [Roll Forward]
Goodwill	1,597	1,604	1,595
Accumulated impairment losses	(4)	(4)	(4)
Goodwill, net	1,600	1,591
Translation and other	(7)	9
Goodwill, net	1,593	1,600
Engineered Structures
Goodwill [Roll Forward]
Goodwill	305	306	306
Accumulated impairment losses	(2)	(2)	(2)
Goodwill, net	304	304
Translation and other	(1)	0
Goodwill, net	303	304
Forged Wheels
Goodwill [Roll Forward]
Goodwill	7	7	7
Accumulated impairment losses	0	0	$ 0
Goodwill, net	7	7
Translation and other	0	0
Goodwill, net	$ 7	$ 7

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	60%
Amortization of intangible assets	$ 33	$ 35	$ 36
Engineered Structures and Fastening Systems
Goodwill [Line Items]
Impairment of goodwill	0
Minimum
Goodwill [Line Items]
Expected amortization for the year 2025	30
Expected amortization for the year 2026	30
Expected amortization for the year 2027	30
Expected amortization for the year 2028	30
Expected amortization for the year 2029	30
Maximum
Goodwill [Line Items]
Expected amortization for the year 2025	36
Expected amortization for the year 2026	36
Expected amortization for the year 2027	36
Expected amortization for the year 2028	36
Expected amortization for the year 2029	$ 36

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 972	$ 967
Accumulated amortization	(519)	(494)
Intangibles, net	453	473
Indefinite-lived trade names and trademarks	22	32
Total other intangible assets, gross	994	999
Total other intangible assets, net	475	505
Computer software
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	217	217
Accumulated amortization	(185)	(182)
Intangibles, net	32	35
Patents and licenses
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	66	67
Accumulated amortization	(66)	(66)
Intangibles, net	0	1
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	689	683
Accumulated amortization	(268)	(246)
Intangibles, net	$ 421	$ 437

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease expense	$ 67	$ 63	$ 61

Leases - Operating Lease Assets

Leases - Operating Lease Assets and Liabilities in the Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other noncurrent assets (A and P)	Other noncurrent assets (A and P)
Right-of-use assets classified in Other noncurrent assets	$ 155	$ 128
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities (A and P)	Other current liabilities (A and P)
Current portion of lease liabilities classified in Other current liabilities	$ 37	$ 32
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other noncurrent liabilities and deferred credits (A and P)	Other noncurrent liabilities and deferred credits (A and P)
Long-term portion of lease liabilities classified in Other noncurrent liabilities and deferred credits	$ 119	$ 97
Total lease liabilities	$ 156	$ 129

Leases - Future Minimum Contrac

Leases - Future Minimum Contractual Operating Lease Obligations (Details) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2025	$ 46
2026	39
2027	29
2028	21
2029	15
Thereafter	39
Total lease payments	189
Less: Imputed interest	(33)
Present value of lease liabilities	$ 156	$ 129

Leases - Right of Use Assets (D

Leases - Right of Use Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Right-of-use assets obtained in exchange for operating lease obligations	$ 66	$ 68	$ 34
Weighted-average remaining lease term in years	5 years 10 months 24 days	6 years 4 months 24 days	5 years 7 months 6 days
Weighted-average discount rate	5.70%	5.90%	5.40%

Debt - Schedule of Long-term De

Debt - Schedule of Long-term Debt (Details) € in Millions, $ in Millions	Dec. 31, 2024 USD ($)	Aug. 23, 2024 USD ($)	Aug. 22, 2024 EUR (€)	Jul. 01, 2024	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Other, net	$ (13)				$ (10)
Long-term debt	3,315				3,706
Less: amount due within one year	6				206
Total long-term debt	$ 3,309				3,500
Currency Swap
Debt Instrument [Line Items]
Derivative liability | €			€ 458
Fixed interest rate (as a percent)			3.72%
5.125% Notes, due 2024
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	5.125%			5.125%
Amount outstanding	$ 0				205
6.875% Notes, due 2025
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	6.875%	6.875%
Amount outstanding	$ 0	$ 577			600
USD Term Loan Agreement, due 2026
Debt Instrument [Line Items]
Amount outstanding	140				200
JPY Term Loan Agreement, due 2026
Debt Instrument [Line Items]
Amount outstanding	$ 188				211
5.900% Notes, due 2027
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	5.90%
Amount outstanding	$ 625				625
6.750% Bonds, due 2028
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	6.75%
Amount outstanding	$ 300				300
3.000% Notes, due 2029
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	3%
Amount outstanding	$ 700				700
4.850% Notes, due 2031
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	4.85%	4.85%
Amount outstanding	$ 500				0
5.950% Notes, due 2037
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	5.95%
Amount outstanding	$ 625				625
4.750% Iowa Finance Authority Loan, due 2042
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	4.75%
Amount outstanding	$ 250				$ 250

Debt - Maturities of Long-term

Debt - Maturities of Long-term Debt (Details) $ in Millions	Dec. 31, 2024 USD ($)
Debt Disclosure [Abstract]
2025	$ 5
2026	323
2027	625
2028	300
2029	$ 700

Debt - Public Debt (Details)

Debt - Public Debt (Details) € in Millions, $ in Millions						1 Months Ended	9 Months Ended	12 Months Ended
	Aug. 23, 2024 USD ($)	Jul. 01, 2024 USD ($)	Dec. 28, 2023 USD ($)	Sep. 28, 2023 USD ($)	Mar. 29, 2023 USD ($)	Jan. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 22, 2024 USD ($)	Aug. 22, 2024 EUR (€)	Jun. 30, 2024 USD ($)
Debt Instrument [Line Items]
Payment for early redemption of debt								$ 5	$ 1	$ 2
Currency Swap
Debt Instrument [Line Items]
Derivative liability | €												€ 458
Fixed interest rate (as a percent)											3.72%	3.72%
6.875% Notes, due 2025
Debt Instrument [Line Items]
Amounts outstanding	$ 577							$ 0	600
Long-term debt, interest rate (as a percent)	6.875%							6.875%
Repurchased face amount													$ 23
4.850% Notes, due 2031
Debt Instrument [Line Items]
Amounts outstanding								$ 500	0
Long-term debt, interest rate (as a percent)	4.85%							4.85%
Redemption price, amount	$ 594
Interest expense	12
Early termination premium	$ 5
Maximum borrowing capacity											$ 500
5.125% Notes, due 2024
Debt Instrument [Line Items]
Amounts outstanding								$ 0	$ 205
Long-term debt, interest rate (as a percent)		5.125%						5.125%
Redemption price, amount		$ 208	$ 506	$ 205
Interest expense					$ 4
Early termination premium					1		$ 2
Early redemption of debt		205	500	200		$ 26	69
Accrued interest		$ 3	6	$ 5
Cash on hand			106
Debt instrument, redemption price, amount redeemed with loan facility			$ 400
Payment for early redemption of debt					150
Repayments of debt					$ 155		$ 71

Debt - Term Loan Facilities (De

Debt - Term Loan Facilities (Details) ¥ in Millions					12 Months Ended
	Dec. 20, 2024 USD ($)	Dec. 27, 2023 USD ($)	Dec. 01, 2023 JPY (¥)	Nov. 22, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 JPY (¥)	Nov. 22, 2023 JPY (¥)	Jul. 27, 2023 USD ($)
Unsecured Debt | Maximum
Debt Instrument [Line Items]
Debt covenants, net debt to consolidated EBITDA ratio				3.75
Unsecured Debt | USD Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 200,000,000
Fixed interest rate (as a percent)					5.67%	5.795%	5.67%
Borrowings		$ 200,000,000
Early redemption of debt	$ 60,000,000
Accrued interest	$ 1,000,000
Amounts outstanding					$ 140,000,000	$ 200,000,000
Unsecured Debt | USD Term Loan | Base Rate
Debt Instrument [Line Items]
Basis spread (as a percent)					0.375%	0.50%
Unsecured Debt | USD Term Loan | SOFR
Debt Instrument [Line Items]
Basis spread (as a percent)					1.375%	1.50%
Unsecured Debt | JPY Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity | ¥								¥ 33,000,000
Basis spread (as a percent)					1.50%	1.625%
Fixed interest rate (as a percent)					1.919%	2.044%	1.919%
Borrowings | ¥			¥ 29,702
Amounts outstanding					$ 188,000,000	$ 211,000,000	¥ 29,702
Other Debt
Debt Instrument [Line Items]
Debt default (in excess of)				$ 100,000,000					$ 100,000,000

Debt - Credit Facility (Details

Debt - Credit Facility (Details)			12 Months Ended
	Jul. 27, 2023 USD ($) extension	Sep. 28, 2021	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Nov. 22, 2023 USD ($)
Debt Instrument [Line Items]
Amounts outstanding			$ 0	$ 0
Borrowings			0	$ 0	$ 0
Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 90,000,000
Line of Credit | Maximum
Debt Instrument [Line Items]
Debt covenants, net debt to consolidated EBITDA ratio	3.75
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement term (in years)	5 years	5 years
Maximum borrowing capacity	$ 1,000,000,000
Number of extension requests | extension	2
Expiration period (in years)	1 year
Maximum additional borrowing capacity	$ 500,000,000
Commitment fee (as a percent)	0.125%
Line of Credit | Revolving Credit Facility | Base Rate
Debt Instrument [Line Items]
Basis spread (as a percent)	0%
Line of Credit | Revolving Credit Facility | SOFR
Debt Instrument [Line Items]
Basis spread (as a percent)	1%
Line of Credit | Revolving Credit Facility | EURIBOR
Debt Instrument [Line Items]
Basis spread (as a percent)	1%
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 500,000,000
Other Debt
Debt Instrument [Line Items]
Debt default (in excess of)	$ 100,000,000					$ 100,000,000

Debt - Commercial Paper (Detail

Debt - Commercial Paper (Details) - USD ($) $ in Millions	Apr. 04, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Commercial Paper		$ 0
Commercial Paper
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,000
Credit agreement term (in years)	397 days

Other Financial Instruments (De

Other Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Restricted cash (less than in 2024 and 2023)	$ 1	$ 1	$ 1
Carrying value
Derivative [Line Items]
Long-term debt, less amount due within one year	3,309	3,500
Fair value
Derivative [Line Items]
Long-term debt, less amount due within one year	$ 3,298	$ 3,504

Cash Flow Information - Schedul

Cash Flow Information - Schedule of Cash Paid for Interest and Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Supplemental Cash Flow Information [Abstract]
Interest, net of amounts capitalized	$ 180	$ 221	$ 224
Income taxes, net of amounts refunded	$ 177	$ 104	$ 50

Cash Flow Information - Narrati

Cash Flow Information - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Supplemental Cash Flow Information [Abstract]
Capital expenditures		$ 97	$ 72	$ 55
Termination notice period (in days)	30 days
Payment timing (in days)	120 days
Supplier invoices subject to future payment		$ 268	$ 258
Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration]		Accounts payable, trade	Accounts payable, trade

Cash Flow Information - Summary

Cash Flow Information - Summary of Supplier Financing Program (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Supplier Finance Program, Obligation [Roll Forward]
Confirmed obligations outstanding at December 31, 2023	$ 258
Invoices confirmed during the year	877
Confirmed invoices paid during the year	(867)
Confirmed obligations outstanding at December 31, 2024	$ 268

Divestitures (Details)

Divestitures (Details) - USD ($) $ in Millions		12 Months Ended
	May 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net realized and unrealized losses(1)		$ (25)	$ (22)	$ (18)
United Kingdom | Engineered Structures
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net realized and unrealized losses(1)	$ (13)	$ (13)

Contingencies and Commitments -

Contingencies and Commitments - Contingencies (Details) € in Millions, $ in Millions

1 Months Ended

12 Months Ended

Jun. 15, 2023 USD ($)

Mar. 31, 2023 USD ($)

Mar. 31, 2023 EUR (€)

Dec. 23, 2020 defendant

Jul. 31, 2024 USD ($)

Jul. 31, 2023 USD ($)

Dec. 31, 2024 USD ($) location

Dec. 31, 2023 USD ($)

Dec. 31, 2023 EUR (€)

Dec. 31, 2024 EUR (€)

Dec. 31, 2022 USD ($)

Dec. 31, 2021 USD ($)

Jun. 26, 2020 USD ($) transaction entity

Loss Contingencies [Line Items]

Number of cleanup locations (more than) | location

30

Remediation reserve balance

$ 19

$ 17

Remediation reserve balance, classified as a current liability

10

7

Payments related to remediation expenses applied against the reserve

2

3

Unrecognized tax benefits

1

16

$ 2

$ 2

Number of defendants | defendant

23

Lehman Brothers International (Europe) (“LBIE”) Claims

Loss Contingencies [Line Items]

Judgment from legal proceeding

$ 40

Number of entities | entity

2

Number of interest rate swap transactions | transaction

2

Estimate of claim

$ 65

Payments for legal settlements

$ 25

$ 15

Foreign Tax Jurisdiction | Ministry of the Economy, Finance and Industry, France | Tax Years 2010 Through 2012

Loss Contingencies [Line Items]

Unrecognized tax benefits

$ 2

€ 2

Estimate of possible loss

$ 17

€ 16

Effective income tax rate reconciliation, tax contingency, amount

$ 21

€ 19

Income Tax And Interest | Foreign Tax Jurisdiction | Ministry of the Economy, Finance and Industry, France | Tax Years 2010 Through 2012

Loss Contingencies [Line Items]

Estimate of possible loss

10

9

Income Tax Penalties | Foreign Tax Jurisdiction | Ministry of the Economy, Finance and Industry, France | Tax Years 2010 Through 2012

Loss Contingencies [Line Items]

Estimate of possible loss

$ 7

€ 7

Maximum | Recurring Costs of Managing Hazardous Substances and Environmental Programs

Loss Contingencies [Line Items]

Percentage of cost of goods sold

1%

Contingencies and Commitments_2

Contingencies and Commitments - Commitments (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024
Loss Contingencies [Line Items]
Purchase obligations due in 2025	$ 237			$ 237
Purchase obligations due in 2026	51			51
Purchase obligations due in 2027	42			42
Purchase obligations due in 2028	40			40
Purchase obligations due in 2029	39			39
Purchase obligations due thereafter	0			$ 0
Indemnification of liability (as a percent)				50%
Guarantees of third party related to project financing	6			$ 6
Combined fair value of guarantees	6	$ 6		6
Insurance annual coverage limit	80	80	$ 80
Total amount committed under outstanding surety bonds	44			44
Amount of outstanding surety bonds relating to these liabilities	21			21
Alcoa Corporation Workers Compensation Claims
Loss Contingencies [Line Items]
Letters of credit, total amount committed	48			48
Arconic Corporation Environmental Obligations
Loss Contingencies [Line Items]
Letters of credit, total amount committed	17			17
Letter of Credit
Loss Contingencies [Line Items]
Maximum borrowing capacity	90			90
Other Noncurrent Liabilities and Deferred Credits | Separation Agreement
Loss Contingencies [Line Items]
Guarantees of third party related to project financing	$ 1,121	$ 1,131		$ 1,121